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IBM Terminology


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E
 
 E1
A digital trunking facility standard used in Europe and elsewhere, capable of transmitting and receiving 30 digitized voice or data channels. Two additional channels are used for synchronization, framing, and signaling. The transmission rate is 2048 kilobits per second. See also T1.
 EAB
See Enterprise Address Book.
 EAC
See estimate at completion.
 EA-enabled table space
A table space or index space that is enabled for extended addressability and that contains individual partitions (or pieces, for LOB table spaces) that are greater than 4 GB.
 E and M
A channel associated signaling protocol in which signaling is done using two leads: an M-lead that transmits battery or ground and an E-lead that receives open or ground.
 EAO exception
See effective address overflow exception.
 EAR
See enterprise archive.
 EAR file
See enterprise archive.
 early resource release
The release of resources (such as devices, volumes, and data sets) after they are no longer needed.
 early token release
A function, supported by token-ring adapter types 2 and 3, that allows a transmitting station to release the token after transmitting the ending delimiter.
 earned value
A measure of the value of work performed so far. Earned value uses original estimates and progress-to-date to show whether the actual costs incurred are on budget and whether the tasks are ahead or behind the baseline plan.
 EAR project
See enterprise application project.
 eavesdropping
A breach of communication security in which the information remains intact, but its privacy is compromised. See also impersonation, tampering.
 EB
See exabyte.
 EBA
See Euro Banking Association.
 EBCDIC
See Extended Binary Coded Decimal Interchange Code.
 EBCDIC character
Any one of the symbols included in the EBCDIC set.
 EBCDIC double-byte encoding scheme
A structure that has separate, allocated coding space for control characters and graphic characters. Control characters do not have 16-bit codes in the EBCDIC structure definition. Graphic characters have a range from 4141 to FEFE. The space character is at 4040.
 EBCDIC single-byte encoding scheme
An 8-bit-per-byte structure. The EBCDIC single-byte structure has a valid code-point range for 00 to FF. Control characters have a range from 00 to 3F. Graphic characters have a range from 41 to FE. The space character is 40.
 e-business
The transaction of business over an electronic medium such as the Internet.
 EBV
See effective Boolean value.
 EC
See engineering change.
 ECB mode
See electronic code book mode.
 ECC
See error correction code.
 ECDSA
See extended CICS dynamic storage area.
 ECF
See Enhanced Connectivity Facility.
 echo
(1) In computer graphics, the immediate notification of the current values provided by an input device to the operator at the display console.
(2) In data communication, a reflected signal on a communication channel. An echo verifies the accuracy of the signal
 echo area
The part of the Prompted Query primary panel in which a prompted query is built.
 echo cancellation
A filter algorithm that is used to compare a copy of the voice data being sent to a caller with the voice data being received from the caller. Any echo of the sent data is removed before the received data is sent on, for example, to a speech recognizer.
 ECI
See external call interface.
 ECKD
See extended count key data.
 ECKD device
See extended count key data device.
 ECL
See execution control list.
 Eclipse
An open-source initiative that provides ISVs and other tool developers with a standard platform for developing plug-compatible application development tools.
 eclipsed
Pertaining to an object in a versioned object base (VOB) that is not visible because another object with the same name is currently selected by the view.
 Eclipse Modeling Framework
The Eclipse components that define and implement structured data models, which are a set of related classes that are used to handle data in applications.
 Eclipse Platform
An open-source, standard platform for building integrated development environments (IDEs) that can be used to create applications, such as Web sites, embedded Java programs, or Enterprise JavaBeans. The platform discovers, integrates, and runs the integrated modules called plug-ins that exist within its environment.
 ECMA
See Ecma International.
 Ecma International (ECMA)
An international association that is dedicated to the standardization of information and communication systems. The ECMA is based in Europe and was founded in 1961.
 e-commerce
The subset of e-business that involves the exchange of money for goods or services purchased over an electronic medium such as the Internet.
 ECSA
See extended common service area.
 ED
(1) See Environment Division.
(2) See enciphered data.
 EDF
See execution diagnostic facility.
 edge
(1) A return value or possible result from a state table action.
(2) In transaction monitoring, the point at which a transaction first comes in contact with the monitoring instrumentation.
 EDGE
See Enhanced Data GSM Environment.
 edge device
A functional unit such as a router or gateway that is deployed at the border of an administrative domain. An edge device controls traffic through one point only.
 Edge Side Include (ESI)
A technology supporting cacheable and noncacheable Web page components that can be gathered and assembled at the edge of a network.
 EDI
See electronic data interchange.
 EDI administrator
The person responsible for setting up and maintaining Data Interchange Services.
 EDI composite data element
A group of related EDI Data Elements, such as the elements that make up a name and address. Maintained as EDI data elements in Data Interchange Services.
 EDI data element
A single item of data in an EDI document, such as a purchase order number, that corresponds to a ROD field in a ROD document definition. An EDI data element is equivalent to a simple element. It is also used to maintain EDI composite data elements.
 EDI document definition
A description or layout of an EDI document, which comprises loops, EDI segments, EDI data elements, and EDI composite data elements. It is equivalent to the layout of an EDI transaction or an EDI message.
 EDI envelope
The EDI segments and EDI data elements that make up the headers and trailers that enclose EDI transaction sets, functional groups, and interchanges.
 EDIFACT
Electronic Data Interchange for Administration, Commerce and Transport (a United Nations standard).
 EDI loop
A group of consecutive EDI segments that repeat together in an EDI document definition. There is no object type in Data Interchange Services that defines an EDI loop on its own. EDI loops are logically defined within an EDI document definition.
 EDI message
In UN/EDIFACT EDI Standards, a group of logically related data that makes up an electronic business document, such as an invoice. It is equivalent to an EDI transaction. Called an EDI document definition in Data Interchange Services.
 EDI message set
A group of logically related data that make up an electronic business document, such as an invoice or a purchase order. A single EDI document. The layout of an EDI transaction is described by an EDI document definition in Data Interchange Services.
 EDI segment
A group of related EDI data elements. An EDI segment is a single line in an EDI document definition, beginning with a segment identifier and ending with a segment terminator delimiter. The EDI data elements in the EDI segment are separated by data element delimiters.
 EDI standard
The industry-supplied, national or international formats to which information is converted, allowing different computer systems and applications to exchange information.
 edit
(1) To add, change, delete, rearrange, or modify the form or format of data.
(2) To change a numeric field for output by suppressing zeros and inserting commas, periods, currency symbols, the sign status, or other constant information.
 editable field
On a form, a field whose value is determined by a formula that application designers write to supply a default value, edit the user's entry, and validate the entry to make sure it meets specific requirements.
 edit code
A letter or number indicating that editing should be done according to a defined pattern before a field is displayed or printed. See also edit word.
 edit description
A description of a user-defined edit code. The system-recognized identifier is *EDTD.
 editing character
In COBOL, a single character or a fixed 2-character combination that punctuates output.
 edition
A successive deployment generation of a particular set of versioned artifacts.
 edit line
In CoOperative Development Environment/400, a string of characters ended either by an end-of-line character sequence or by the end of the file.
 edit mask
A byte string that tells the edit machine instruction or the Edit (QECEDT) API how to format a numeric value into a readable character string. An edit mask can format a numeric value so that languages that cannot use machine instructions directly can take advantage of this function.
 edit mode
The state in which users can create or modify a document.
 editor
An application that enables a user to modify existing data.
 editor access
An access level that allows users to create, read, and edit any documents. Servers can replicate new documents, change existing documents, and, if they have delete access, make deletions.
 editor area
In Eclipse and Eclipse-based products, the area in the workbench window where files are opened for editing.
 editor program
A computer program designed to perform such functions as rearrangement, modification, and deletion of data in accordance with prescribed rules.
 EDI transaction
In X12 EDI Standards, a group of logically related data that makes up an electronic business document, such as an invoice. It is equivalent to an EDI message. The layout of an EDI transaction is described by an EDI Document Definition in Data Interchange Services.
 EDI transaction set
A group of logically related data that make up an electronic business document, such as an invoice or a purchase order. A single EDI document.
 edit word
A user-defined word with a specific format that indicates how editing should be done. See also edit code.
 EDL
See exchange data link.
 E_D_TOV
See error detect timeout value.
 EDU
See engine dispatchable unit.
 EE_credit
See end-to-end credit.
 EEQE
See extended error queue element.
 EFD
See event forwarding discriminator.
 effective address overflow exception (EAO exception)
In Performance Tools, a condition in which the Licensed Internal Code must make address adjustments not made above the machine interface.
 effective Boolean value (EBV)
The result of converting a sequence of items into a logical value of true or false.
 effective configuration
The particular zone configuration that is currently in effect. Only one configuration can be in effect at once. The effective configuration is built each time a zone configuration is enabled.
 effective group ID
(1) An attribute of a process that is used in determining various permissions, including file access permissions.This value is subject to change during the process lifetime.
(2) The current group ID, but not necessarily the user's own ID. For example, a user logged in under a particular group ID might be able to change to another group ID. The ID to which the user changes then becomes the effective group ID.
 effective user
In Notes, the user under whose authority an agent runs. The effective user name will be used for database ACL access rights; rights to create databases, replicas, and templates on the server; and as the mail sender or document author. Effective user rights are not used to determine the operations an agent is permitted to perform; these are based on the agent signer (the agent owner).
 effective user ID
The current user ID, although not necessarily the user's login ID. For example, if a user logged in under a login ID changes to another user's ID, that ID becomes the effective user ID until the user returns to the original login ID. All discretionary access decisions are based on the effective user ID.
 effector
An interface that enables an external agent (such as an autonomic manager) to perform operations or change the state of a managed resource. An effector is used to alter data in a managed resource, whereas a sensor is used to retrieve data from a managed resource. See also managed resource, execute component, manageability interface, sensor, touchpoint.
 E-format
A character data in scientific notation, where a numeric value part is followed by an exponent indicator, usually the letter 'E', and a possibly signed integer that indicates a power of ten by which the numeric value should be multiplied.
 EGL
See Enterprise Generation Language.
 EGL build file
An XML file with an .eglbld extension, used to store definitions of EGL build parts.
 EGL file
An Enterprise Generation Language program file (extension .eglpgm), definitions file (extension .egldef), or build file (extension .eglbld).
 EGL keyword
A term that begins an EGL statement that is neither a function invocation nor an assignment statement. Keywords include add and delete.
 EGL source file
A text file with an .egl extension, used to store definitions of EGL data, logic, and UI parts.
 EGL statement
A directive that is coded into an EGL function part to cause an action when the generated program runs. Examples include an EGL assignment statement and an EGL add statement.
 EGP
See Exterior Gateway Protocol.
 EHLLAPI
See Emulator High-Level Language Application Programming Interface.
 EIA
See Electronic Industries Association.
 EIA-232
In data communications, a specification of the Electronic Industries Association (EIA) that defines the interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) using serial binary data interchange.
 EIA-422
In data communication, a specification of the Electronic Industries Association (EIA) that defines the electrical characteristics for balanced voltage digital interface circuits for the interchange of serial binary data between data terminal equipment (DTE) and data circuit-terminating equipment (DCE), or any point-to-point interconnection of serial binary signals between digital equipment.
 EIA-423
In data communication, a specification of the Electronic Industries Association (EIA) that defines the electrical characteristics for unbalanced voltage digital interface circuits for the interchange of serial binary data between data terminal equipment (DTE) and data circuit-terminating equipment (DCE), or any point-to-point interconnection of serial binary signals between digital equipment. The international equivalent is CCITT Recommendation V.10.
 EIA-449
In data communication, a specification of the Electronic Industries Association (EIA) that defines the interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) employing serial binary data interchange. EIA-449, together with EIA-422 and EIA-423, is intended to gradually replace EIA-232 and is used for high speed data transmission (up to 10 Mbps). There is no international equivalent, although ISO 4902 is partly covered in 449.
 EIA rack
A storage rack that meets the standards set by the Electronics Industry Association (EIA).
 EIA unit
A unit of measure, established by the Electronic Industries Association, equal to 44.45 millimeters (1.75 inches).
 EIB
See EXEC interface block.
 EID
(1) See event identifier.
(2) See enterprise identifier.
 EIM
See Enterprise Identity Mapping.
 EIP
See execution interface program.
 EIS
See enterprise information system.
 EISA
See Extended Industry Standard Architecture.
 EJB
See Enterprise JavaBeans.
 EJB bean
See enterprise bean.
 EJB container
A container that implements the EJB component contract of the Java EE architecture. This contract specifies a runtime environment for enterprise beans that includes security, concurrency, life cycle management, transaction, deployment, and other services. (Sun) See also EJB server.
 EJB context
In enterprise beans, an object that allows an enterprise bean to invoke services provided by the container and to obtain information about the caller of a client-invoked method. (Sun)
 EJB factory
An access bean that simplifies the creating or finding of an enterprise bean instance.
 EJB home object
In Enterprise JavaBeans (EJB) programming, an object that provides the life cycle operations (create, remove, find) for an enterprise bean. (Sun)
 EJB inheritance
A form of inheritance in which an enterprise bean inherits properties, methods, and method-level control descriptor attributes from another enterprise bean that resides in the same group.
 EJB JAR file
A Java archive that contains an EJB module. (Sun)
 EJB module
A software unit that consists of one or more enterprise beans and an EJB deployment descriptor. (Sun)
 EJB object
In enterprise beans, an object whose class implements the enterprise bean remote interface (Sun).
 EJB project
A project that contains the resources needed for EJB applications, including enterprise beans; home, local, and remote interfaces; JSP files; servlets; and deployment descriptors.
 EJB query
In EJB query language, a string that contains an optional SELECT clause specifying the EJB objects to return, a FROM clause that names the bean collections, an optional WHERE clause that contains search predicates over the collections, an optional ORDER BY clause that specifies the ordering of the result collection, and input parameters that correspond to the arguments of the finder method.
 EJB query language
A query language that defines finder methods for entity beans with container managed persistence. The definition uses a language based on SQL that allows searches on the persistent attributes of an enterprise bean and associated bean attributes.
 EJB reference
A logical name used by an application to locate the home interface of an enterprise bean in the target operational environment.
 EJB server
Software that provides services to an EJB container. An EJB server may host one or more EJB containers. (Sun) See also EJB container.
 eject
The process by which a volume is removed from a system-managed library.
 eject to front facing (ETFF)
A flag used in a resource exit to tell PSF to bypass the eject-to-front-facing function.
 elaborated type specifier
Typically used in C++ in an incomplete class declaration or to qualify types that are otherwise hidden.
 elaboration
The phase of the software development life cycle in which the functions and the architecture of a product are defined.
 electromagnetic compatibility (EMC)
The design and test of products to meet legal and corporate specifications dealing with the emissions and susceptibility to frequencies in the radio spectrum. Electromagnetic compatibility is the ability of various electronic equipment to operate properly in the intended electromagnetic environment.
 electromagnetic interference (EMI)
Waves of electromagnetic radiation, including but not limited to radio frequencies, generated by the flow of electric current.
 electronic code book mode (ECB mode)
A method of enciphering and deciphering data in address spaces or data spaces. Each 64-bit block of plaintext is separately enciphered and each block of the ciphertext is separately deciphered.
 electronic customer support
A part of the operating system that allows a customer to access the question-and-answer (Q & A) function; problem analysis, reporting, and management; IBM product information; and technical information exchange.
 electronic data interchange (EDI)
The exchange of structured electronic data between computer systems according to predefined message standards.
 electronic document
A document that is stored on the computer, instead of printed on paper.
 electronic form
A collection of constant data that is electronically composed in the host processor and may be merged with variable data on a page during printing.
 Electronic Industries Association (EIA)
An organization of electronics manufacturers that advances the technological growth of the industry, represents the views of its members, and develops industry standards.
 electronic keystick
A device that slides into a slot on some System i product control panels. When the keystick is in place, it electronically unlocks functions at the key pad on the control panel. This allows a system operator to select an operating mode. When the keystick is removed, those functions are electronically locked, which prevents those without authority from placing the machine in some other mode.
 electronic overlay
An AFP resource object that is a collection of predefined data, such as lines, shading, text, boxes, or logos, that can be merged with variable data on a page while printing.
 electronic serial number (ESN)
Unique identification number embedded in a wireless phone by the manufacturer to prevent fraud. ESN differs from the mobile identification number, which is the wireless carrier's identifier for a phone in the network.
 Electronic Service Agent
An i5/OS function that provides automatic hardware problem-reporting to help predict and prevent hardware errors by early detection of potential problems. With this function, users can also download fixes and automatically submit problems to IBM when appropriate.
 electronic signature
A stamp added to mail messages, fields, or sections that verifies that the person who originated the message is the author and that no one has tampered with the data.
 electrostatic discharge (ESD)
(1) The flow of current that results when objects having a static charge come into close enough proximity to discharge.
(2) An undesirable discharge of static electricity that can damage equipment and degrade electrical circuitry.
 element
(1) In markup languages, a basic unit consisting of a start tag, end tag, associated attributes and their values, and any text that is contained between the two.
(2) The smallest unit in a table, array, list, set, or other structure. Examples of an element are a value in a list of values and a data field in an array.
(3) A named piece of information, or a field, within a message, that has a business meaning agreed by the applications that create and process the message.
(4) An object that encompasses a set of versions, organized into a version tree.
(5) A constituent of a model.
(6) A component of a document, such as an EDI, XML, or ROD record. An element can be a simple element or a compound element.
(7) A part of a section. Each element represents a separate class of data and is identified by a section name and class name.
(8) A value in a security label component. See also security label component.
(9) In Java development tools, a generic term that can refer to packages, classes, types, interfaces, methods, or fields.
 element address
In SNA, a value in the element field of the network address that identifies a specific resource within a subarea.
 elementary item
In COBOL, a data item that cannot be further logically subdivided.
 element equality
A relation that determines if two elements are equal.
 element mark
In AFP Utilities, a mark that is used to show the position of an element on a display; for example, '*B005' where B means bar code and 005 is the fifth element. See also element name.
 element name
In AFP Utilities, a name that appears in the image area instead of an element mark. See also element mark.
 element occurrence
A single instance of an element in a collection. In a unique collection, element occurrence is synonymous with element value.
 element separator
See data element delimiter.
 element type
A property of an element that specifies how versions of that element are constructed.
 element value
All the instances of an element with a particular value in a collection. In a non-unique collection, an element value may have more than one occurrence. In a unique collection, element value is synonymous with element occurrence.
 ELF message
See external line format message.
 eligibility age
The number of days since a data set met its criteria to be migrated.
 eligible machine
A machine that runs an eligible operating system and can be partitioned.
 eligible operating system
An operating system using a partitioning technology as specified by Passport Advantage.
 eligible program
A programs that meets the conditions described by Passport Advantage.
 ELLC
See enhanced logical link control.
 ELPA
See extended link pack area.
 else clause
The part of an if statement that contains the keyword 'else' followed by a statement. The else clause provides an action that is started when the if condition evaluates to a value of 0 (false).
 ELT
See extract, load, and transform.
 e-mail
Documents and messages that are transmitted between users over a communication network.
 e-mail activity
A method of delivering merchandising and marketing content to customers. E-mail activities deliver customized e-mail messages, based on JSP templates, which can include advertisements, suggestive selling initiatives, and promotions, among other merchandising and marketing content.
 e-mail template
An e-mail outline that serves as the basis for e-mail content issued via an e-mail activity. The e-mail template is a model by which the business user defines e-mail message content and optional placeholders for personalized content.
 e-Marketing spot
In WebSphere Commerce, data on a Web page that typically results from a marketing activity such as a campaign.
 embedded blank
A space between characters within a unit of data.
 embedded command
A command enclosed as a value within another command.
 embedded SQL
An SQL statement that is coded within an application program. See also Call Level Interface.
 embedded system
A computer system that is a component of a larger machine or system. Embedded systems can respond to events in real time. Hosts of embedded systems include watches, household appliances, cars, and cellular phones.
 embedded text control
One or more bytes of control information, preceded by an escape character, contained within a set of text. The text control controls certain operations on following text, but it is not itself printed.
 embedded workflow
A workflow that is only functional if it is employed with the surrounding, or embedding, system. The workflow functionality of embedded workflows is exhibited by the surrounding software system. An example is an Enterprise Resource Planning (ERP) system. See also autonomous workflow.
 EMC
See electromagnetic compatibility.
 e-meeting
See Web conference.
 emergency power off (EPO)
A means of turning off power during an emergency, referring usually to a switch.
 emergency restart
(1) A restart of IMS following an IMS or MVS failure. See also normal restart, cold start.
(2) The CICS backout facility for an automatic restart following a system failure. It restores the recoverable resources updated by each interrupted transaction to the condition they were in when the transaction started.
 emergency thread
A server thread that becomes available when either the work queue (the number of pending operations) or the time limit threshold since the last item was removed from the work queue is exceeded. This thread provides a method for the administrator to access the server during a denial of service attack.
 EMH
See expedited message handling.
 EMHQ
See expedited message handler queue.
 EMI
See electromagnetic interference.
 EMIF
See ESCON multiple image facility.
 emitter
A program that takes the output from one system and converts the information into a different form.
 emitter factory
A type of factory that handles the details of event transmission such as the event server location, the filter settings, or the underlying transmission mechanism.
 EMP
See event monitoring point.
 emphasis
Highlighting, color change, or other visible indication of conditions relative to an object or choice that affects a user's ability to interact with that object or choice. Emphasis can also give a user additional information about the state of a choice or an object.
 employee number
An identification number for each employee in a company.
 empty activity
An activity with no defined implementation that can be used as a place holder in the design stage.
 empty data set
A data set in which the pointer to the last-used block is 0.
 empty line
A line consisting of only a newline character. X/Open.
 empty range
The part of a VSAM file that is available for insertion of new records.
 empty string
A character array whose first element is a null character.
 emulation
The use of software, hardware, or both by one system to imitate another system. The imitating system accepts the same data, runs the same programs, and achieves the same results as the imitated system.
 emulation program
(1) A control program that permits functions written for one system or device to be run on another system or device.
(2) A program that allows a host system to communicate with a workstation in the same way as it would with the emulated terminal.
 emulator
(1) A program that causes a computer to act as a workstation attached to another system.
(2) A facility of the integration test client that enables the emulation of components and references during module testing. Emulators are either manual or programmatic. See also manual emulator, programmatic emulator.
 Emulator High-Level Language Application Programming Interface (EHLLAPI)
An application programming interface that provides programming access to the area in computer memory that corresponds to the user's screen image (this area in memory is known as the "presentation space").
 enabled
(1) Pertaining to a state of the processing unit that allows the occurrence of certain types of interruptions. See also disabled.
(2) Pertaining to the state in which a communication device can accept incoming calls on a line.
(3) In VTAM, pertaining to a logical unit (LU) that has indicated to its system services control point (SSCP) that it is ready to establish LU-LU sessions. The LU can separately indicate whether this prevents it from acting as a primary logical unit (PLU) or a secondary logical unit (SLU). See also disabled, inhibited.
(4) A condition of the printer (physically selected) in which the printer is available to the host processor for normal work. The enabled condition is also called online.
(5) Pertaining to a condition that results in the execution of condition handlers or in the performance of a standard system action to handle the condition.
 enabled zone configuration
The currently enabled configuration of zones. Only one configuration can be enabled at a time. See also defined zone configuration, zone configuration.
 enablement
The determination by a language at run time that an exception should be processed as a condition. The exception is intercepted and a determination is made whether to ignore the exception.
 enablement step
The first step of the condition handling model during which it is determined whether an exception is to be enabled and processed as a condition. See also condition step, termination imminent step.
 enabling-new-function mode (ENFM)
A transitional mode of operation in the version-to-version migration process, during which the DB2 subsystem or data sharing group prepares to use the new functions of the new version. When operating in enabling-new-function mode, a DB2 data sharing group cannot coexist with members that operate at the prior version level. In enabling-new-function mode, fallback to a prior version is not supported, and new functions of the new version are not available for use. See also enabling-new-function mode*, compatibility mode, compatibility mode*.
 enabling-new-function mode* (ENFM*)
A transitional mode of operation in the version-to-version migration process that applies to a DB2 subsystem or data sharing group that was in new-function mode (NFM) at one time. When operating in enabling-new-function mode*, a DB2 subsystem or data sharing group is preparing to use the new functions of the new version but cannot yet use them. A data sharing group that operates in enabling-new-function mode* cannot coexist with members that operate at the prior version level. Fallback to a prior version is not supported. See also enabling-new-function mode, compatibility mode, compatibility mode*.
 Encapsulated Security Payload (ESP)
In a virtual private network (VPN), a security protocol that provides data confidentiality and integrity.
 encapsulation
(1) In communication, a technique used by layered protocols by which a layer adds control information to the protocol data unit (PDU) from the layer it supports. In this respect, the layer encapsulates the data from the supported layer. In the Internet suite of protocols, for example, a packet would contain control information from the physical layer, followed by control information from the network layer, followed by the application protocol data. See also decapsulation.
(2) In object-oriented programming, the technique that is used to hide the inherent details of an object, function, or class from client programs.
 enchain
To reduce the size of a dictionary file. The process converts a series of single entry linear search nodes into a single chain node for the entire string, thus reducing the size of the finite state transducer (FST). Typically, enchaining is less efficient at reducing the size of a dictionary than contraction.
 encipher
To scramble data or to convert data to a secret code that masks the meaning of the data to any unauthorized recipient.
 enciphered data (ED)
The encryption of data so that its meaning is concealed from unauthorized users or observers.
 enclave
(1) In Language Environment, an independent collection of routines, one of which is designated as the main routine. An enclave is similar to a program or run unit.
(2) A transaction that can span multiple dispatchable units (service request blocks and tasks) in one or more address spaces and is reported on and managed as a unit.
 enclosed document
A document that is contained within another document.
 enclosure
A unit that houses the components of a storage subsystem, such as a control unit, disk drives, and power source.
 encode
To convert data by the use of a code in such a manner that reconversion to the original form is possible.
 encoded format
In query management, the format of the data in an externalized form file.
 encoded-vector index
A DB2 for i5/OS index that is specialized for quick row selection in query processing. This type of index also provides accurate database statistics, which can improve the optimization of queries. See also radix-tree index.
 encoding scheme
(1) The underlying part of a code page that defines: a) the coding space (the number and allowable value of code points in a code page); b) the rules for sharing the coding space between control and graphic characters; and c) the rules related to the specific options permitted in that scheme, such as the number of bits in a byte, single-byte, or double-byte.
(2) The set of rules that specifies the values for control characters and graphic characters. Examples of encoding schemes include ASCII, ISO/IEC 10646, Unicode and IBM's EBCDIC.
(3) A set of rules to represent character data.
 ENCP
See end-node control point.
 encrypt
In Cryptographic Support, to systematically scramble information so that it cannot be read without knowing the coding key. See also decrypt.
 encryption
In computer security, the process of transforming data into an unintelligible form in such a way that the original data either cannot be obtained or can be obtained only by using a decryption process.
 encryption algorithm
An algorithm that scrambles the data so that it becomes unreadable to someone who intercepts it.
 encryption key
Security feature that ensures that only the intended recipient can read encrypted text. Every Notes user ID contains two: a public key for sending and encrypting and a private key for receiving and decrypting. Users may also have a public and private key for S/MIME encryption and signatures.
 end bracket
In SNA, the value (binary 1) of the end bracket indicator in the request header (RH) of the first request of the last chain of a bracket; the value denotes the end of the bracket. See also conditional end bracket.
 endian
An attribute of data that describes whether it is stored in computer memory or transmitted with the most significant byte first or last. See also big endian, little endian.
 ending attribute character
For a display file, the character following the last position in a field.
 end node
(1) In SNA, a node in an APPN network that can be a source or target node, but does not provide any routing or session services to any other node.
(2) A visual marker within a process that identifies where a particular flow ends. Other concurrent flows within the same process will still continue executing.
 end-node control point (ENCP)
A control point that provides its own configuration, session, and management services with assistance from the control point in its serving network node. An ENCP is capable of engaging in CP-CP sessions with other nodes.
 end of block (EOB)
A code that marks the end of a block of data.
 end-of-chain (EOC)
In SNA, an exception condition that occurs when the end-of-chain indicator is set in the request/response unit (RU) returned from VTAM.
 end-of-day statistics
(1) In CICS Transaction Server, CICS statistics written to an SMF data set at the quiesce or termination of a CICS run, or at a user-specified time. See also interval statistics, unsolicited statistics.
(2) In CICS/VSE, CICS statistics written to the CSSL transient data destination at the quiesce or termination of a CICS run, or at a user-specified time. End-of-day statistics are reset by an end-of-day statistics collection.
 end-of-file (EOF)
(1) On a data medium, a coded character indicating the end of the medium.
(2) A code that signals that the last record of a file has been read.
 end-of-file delay
An interval during which the system holds a file open after the normal end of the file is reached until one or more records are updated or added to the end of the file. The length of the interval can be specified on the EOFDLY parameter.
 end-of-file label
In a file, an internal label indicating the end of the file.
 end of job (EOJ)
 end of memory (EOM)
The outer boundary of an address space.
 end-of-message (EOM)
In a DBCTL multisegment command, the ENTER key, which is the indicator that defines the end of the last or only segment. See also end-of-segment.
 End of Procedure Division
In COBOL, the physical position of a COBOL source program after which no further procedures appear.
 end-of-segment (EOS)
In a DBCTL multisegment command, the command recognition character followed by the ENTER key, which indicates the end of each segment preceding the last segment. See also end-of-message.
 end-of-tape marker (EOT marker)
A reflective material placed on a magnetic tape to indicate the end of the recording area.
 end-of-text character (ETX character)
The BSC transmission control character used to end a logical set of records that began with the start-of-text character. See also end-of-transmission-block character.
 end-of-transmission-block character (ETB character)
The BSC transmission control character used to end a block of records. See also end-of-text character.
 end-of-transmission character (EOT character)
A transmission control character used to indicate the conclusion of a transmission that may have included one or more texts and any associated message headings.
 endpoint
(1) The system that is the origin or destination of a session.
(2) A host or gateway that comprises part of a virtual private network (VPN) connection.
(3) The ultimate recipient of an operation.
(4) A JCA application or other client consumer of an event from the enterprise information system.
 endpoint list
In a Tivoli environment, a list of all endpoints in a Tivoli region with their assigned gateways.
 endpoint listener
The point or address at which incoming messages for a Web service are received by a service integration bus.
 endpoint map
In the Distributed Computing Environment (DCE) Remote Procedure Call (RPC), a database local to a node where local RPC servers register binding information associated with their interface identifiers and object identifiers.
 endpoint map service
In the Distributed Computing Environment (DCE) Remote Procedure Call (RPC), a service provided by the RPC daemon that maintains a system's endpoint map for local RPC servers. See also partially bound binding handle.
 endpoint method
In a Tivoli environment, a method that runs on an endpoint as the result of a request from another managed resource. Results of the method are forwarded to the gateway, and then to the calling managed resource.
 endpoint reference (EPR)
The combination of the address of a Web service that implements the manageability interface for a managed resource type and the properties that allow that Web service to identify the managed resource. See also managed resource ID.
 endpoint system
Any system that is running i5/OS and is connected to the central system. An endpoint system is defined from the central system for the purpose of performing System i Navigator functions.
 end program header
In COBOL, a combination of words, followed by a separator period, that indicates the end of a COBOL source program. The end program header is: END PROGRAM program-name.
 end session handler
A user-provided part of a FEPI application that handles end of conversation and end of session processing.
 end system
(1) See destination node.
(2) The last system in a chain of systems that are linked by any combination of TELNET and pass-through requests.
 end-to-end connection type
In OSI, the type of network service connection used between the local and destination node, that is connection mode, connectionless mode, or both.
 end-to-end credit (EE_credit)
In fibre-channel technology, a credit scheme used to manage end-to-end flow control during the exchange of frames between two communicating devices. See also buffer-to-buffer credit, end-to-end flow control.
 end-to-end flow control
The regulation of data transfers over an interface between a source and target. See also end-to-end credit.
 end-to-end latency
In SQL replication, an approximate measurement of the difference between the time that a change takes place in a source table and the time that the change is applied to a target table. See also latency, Apply latency, Capture latency, Q Apply latency, Q Capture latency, queue latency.
 end-to-end privacy
The process of securing data from a source adapter process, through the WebSphere InterChange Server, to the destination adapter process, ensuring authentication, integrity, and privacy.
 end-to-end probe platform (EPP)
A platform that gathers application performance data and simulates transactions, such that probes can be created to monitor the application appropriately.
 end-to-end scheduling
The process of scheduling, controlling, and running jobs across different platforms.
 end-user significant status
A type of significant status that relates to the work associated with a resource. IMS defines conversations, set-and-test-sequence numbers terminals, and Fast Path as end-user significant status for nodes and users. See also command significant status.
 end-user terminal
A terminal where an IMS user can issue transactions, some commands (based upon security authorization), and message switches.
 end-user verification
For logical unit (LU) 6.2, checking the identification of users by means of identifiers and passwords on attach function-management headers (FMHs).
 ENFM
See enabling-new-function mode.
 ENFM*
See enabling-new-function mode*.
 enforced lock
A type of lock that a process holds on a region of a file preventing any other process from accessing that region with read or write system calls. In addition, the create command is prevented from truncating the files. See also advisory lock.
 enforced subset match conversion/substitution
A conversion where the characters that exist in both the source coded character set identifier (CCSID) and the target CCSID have their integrity maintained. Characters that are not included in the target CCSID are presented to the user as substitution characters. This substitution is permanent. Any loss of character integrity is permanent. An EBCDIC-encoded character that is in the source CCSID but not in the target CCSID is replaced with 3F.
 enforcement
In privacy management, the process of determining whether personally identifiable information (PII) can be accessed. The monitor levels are audit mode and enforcement mode. See also audit mode.
 engagement model
A model for a complex set of activities that use a generalized set of methodologies and logical relationships.
 engine
(1) A speech recognition process that accepts voice data as input and returns the text form of what was said as output. It is the process which performs the recognition.
(2) The unit that contains the processors that respond to requests for data from clients. The operating software for the IBM TotalStorage appliance resides in the engine. See also storage port.
(3) The unit that hosts the software for the metadata server.
 engine dispatchable unit (EDU)
A DB2 structure that coordinates application requests to a DB2 database by using a process (on UNIX operating systems) or a thread (on Windows operating systems) to carry out instructions on behalf of the DB2 database system. See also agent.
 engineering change (EC)
An update to a machine, part, or program. Each EC for a given unit is assigned a unique number referred to as an EC level or EC number.
 engine type
Each engine must be configured with a specific type. The type is simply a textual tag associated with a specific engine and does not change the operation or functionality of the engine.
 Enhanced 5250 Emulation
A program that allows a personal computer and a printer to be attached to a System i product and perform the functions of one or two 5250 workstations on one twinaxial cable. The workstations can be one display station, two display stations, or one display station and one printer.
 enhanced conflict detection
In SQL replication, conflict detection that guarantees data integrity among all replicas and the source table. The Apply program locks all replicas or user tables in the subscription set against further transactions. It begins detection after all changes made prior to locking have been captured.
 Enhanced Connectivity Facility (ECF)
A set of programs that allows a user to access IBM-supplied servers or to create servers.
 Enhanced Data GSM Environment (EDGE)
A faster version of the GSM wireless service that is designed to deliver data at rates up to 384 Kbps and enable the delivery of multimedia and other broadband applications to mobile phone and computer users. The EDGE standard is built on the existing GSM standard, using the same time-division multiple access (TDMA) frame structure and existing cell arrangements.
 enhanced logical link control (ELLC)
An X.25 protocol that allows the transfer of data link control information between two adjoining SNA nodes that are connected through an X.25 packet-switching data network. ELLC enhances error detection and recovery. See also physical services header, Qualified Logical Link Control.
 enhanced NWS
A character-based 5250 workstation with an enhanced character set that allows the presentation of characters that look like graphical symbols.
 Enhanced X-Windows
A collection of basic functions for developing a variety of application environments. Toolkit functions manage Toolkit initialization, widgets, memory, events, geometry, input focus, selections, resources, translation of events, graphics contexts, pixmaps, and errors.
 enhancement request
A change request for a new feature or functionality. See also change request.
 ENQ character
See enquiry character.
 enqueue
To put a message or item in a queue. See also dequeue.
 enqueued
Pertaining to a task that is scheduled to update a physical segment of a database when another task is currently accessing that segment.
 enquiry character (ENQ character)
The BSC transmission control character usually used to request a response from the remote system or device.
 enroll
In Backup, Recovery, and Media Services, to identify media to Backup, Recovery, and Media Services. Media initialized in Backup, Recovery, and Media Services does not need to be enrolled.
 enrollment
(1) The process of entering and saving user or user group information in a portal.
(2) An entitlement for an organization to subscribe to a business service.
 enterprise
(1) The composite of all operational entities, functions, and resources that form the total business concern and that require an information system.
(2) The aggregate of an organization's data center complexes. The enterprise is an object that is at the top of the hierarchical model of Tivoli Manager for OS/390 and Tivoli Availability Infrastructure Services.
 Enterprise Address Book (EAB)
A collection of information about people, departments, and locations in an enterprise. Information about people may include telephone numbers, mailing addresses, and the department in which a person works. Department information may include the department name, the manager, and the department name the department reports to. Location information may contain a mailing address. On a System i product, the EAB is the system distribution directory.
 enterprise application
See Java EE application.
 enterprise application project (EAR project)
A structure and hierarchy of folders and files that contain a deployment descriptor and IBM extension document as well as files that are common to all Java EE modules that are defined in the deployment descriptor.
 enterprise archive (EAR)
A specialized type of JAR file, defined by the Java EE standard, used to deploy Java EE applications to Java EE application servers. An EAR file contains EJB components, a deployment descriptor, and Web archive (WAR) files for individual Web applications. See also Web archive, Java archive.
 enterprise bean
A component that implements a business task or business entity and resides in an EJB container. Entity beans, session beans, and message-driven beans are all enterprise beans. (Sun) See also bean.
 enterprise configuration
A method of setting up servers so that the administrator can distribute the configuration of one of the servers to the other servers, using server-to-server communication.
 enterprise database
A database that is designed to support a large, networked organization. An enterprise database offers scalability, security, and administrative features for large, complex projects.
 enterprise discovery server
A discovery server that aggregates the data collected by domain discovery servers and presents a view of all the collected configuration item information.
 Enterprise Generation Language (EGL)
A high-level language that allows developers to focus on business logic as they create complex business applications for deployment in any of several environments, including the Web. The language simplifies database and message-queue access, as well as the use of Java EE.
 enterprise identifier (EID)
A work identifier for a distributed transaction that is both a local and a global identifier. The format of the EID is a concatenation of the transaction identifier (TID) and global transaction identifier (GTID).
 Enterprise Identity Mapping (EIM)
A mechanism for associating a person or entity to the appropriate user identities in various user registries throughout an enterprise. EIM provides application programming interfaces (APIs) for creating and managing these identity mapping relationships, as well as APIs that applications use to query this information.
 Enterprise Information Portal
Software developed by IBM that provides tools for advanced searching, and content customization and summarization.
 enterprise information system (EIS)
(1) In System Manager, all the resources that the applications manage and the functions for managing them.
(2) The applications that comprise an enterprise's existing system for handling companywide information. An enterprise information system offers a well-defined set of services that are exposed as local or remote interfaces or both. (Sun) See also resource adapter.
 Enterprise JavaBeans (EJB)
A component architecture defined by Sun Microsystems for the development and deployment of object-oriented, distributed, enterprise-level applications (Java EE).
 enterprise resource planning (ERP)
The planning and management of all the resources in an enterprise.
 enterprise search administrator
An administrative role that enables a user to administer the entire enterprise search system.
 enterprise search base annotator
A set of standard text analysis engines used in enterprise search for default document analysis processing. See also custom text analysis engine.
 enterprise service
A service that typically accesses one or more enterprise information systems (EIS).
 enterprise service bus (ESB)
A flexible connectivity infrastructure for integrating applications and services; it offers a flexible and manageable approach to service-oriented architecture implementation.
 Enterprise Systems Architecture (ESA)
A hardware architecture that reduces the effort required for managing data sets and extends addressability for system, subsystem, and application functions.
 Enterprise Systems Architecture/390 (ESA/390)
An IBM architecture for mainframe computers and peripherals. Processor systems that follow the ESA/390 architecture include the ES/9000 family. See also z/Architecture.
 Enterprise Systems Connection
A peripheral interface for an Enterprise Systems Architecture/390 and zSeries computer. The I/O interface uses ESA/390 logical protocols over a serial interface that configures attached units to a communication fabric.
 entitlement
(1) In security management, a service and list of attributes that identifies the target for a provisioning policy.
(2) A data structure that contains externalized security policy information. Entitlements contain policy data or capabilities that are formatted in a way that is understandable to a specific application.
 entity
(1) In OSI, the representation of a layer on a given open system.
(2) A person, object, or concept about which information is stored.
(3) In markup languages such as XML, a collection of characters that can be referenced as a unit, for example to incorporate often-repeated text or special characters within a document.
(4) In object-oriented design, an item that can be treated as a unit and, often, as a member of a particular category or type. An entity can be a concrete thing or an abstract idea.
(5) A user, group, or resource that is defined to RACF.
 entity bean
In EJB programming, an enterprise bean that represents persistent data maintained in a database. Each entity bean carries its own identity. (Sun) See also session bean.
 entity class
A class used to model information that has been stored by the system, and the associated behavior. A generic class, reused in many use cases, often with persistent characteristics. An entity class defines a set of entity objects, which participate in several use cases and typically survive those use cases.
 entropy
The minimum number of bits needed to represent the information that is contained in a message.
 entry
(1) An element of information in a table, list, queue, or other organized structure of data or control information.
(2) An item in an index. It consists of a main entry plus a locator, and can also have subentries or cross-references.
(3) A collection of information about a cataloged object in a master or user catalog. See also entry name.
 entry action
An action executed on a object when it enters any state in a state machine.
 entry breakpoint
A breakpoint set on a component element that is hit before the component element is invoked.
 entry field
An area on a display where a user can enter information, unless the field is read-only. The boundaries of an entry field are usually indicated.
 entry format
The description of a personal directory entry. Each personal directory entry has an identical structure. The entry structure determines the type and size of each field in a personal directory entry.
 entry name
(1) In assembler language, a programmer-specified name within a control section that identifies an entry point and can be referred to by any control section.
(2) A unique name for an entry, which is the same as the data set name in a data definition (DD) statement that describes the object. See also entry.
 entryOwner
An attribute that can be a user or a group, similar to what is allowed within the aclEntry. Each object has an associated entryOwner attribute. However, the entryOwner subject has certain privileges over the object.
 entry point
The address or label of the first instruction processed or entered in a program, routine, or subroutine.There might be a number of different entry points, each corresponding to a different function or purpose.
 entry sequence
A physical ordering of data records in auxiliary storage according to ascending relative byte address (RBA) without respect to their contents. See also key sequence.
 entry-sequenced data set (ESDS)
(1) A VSAM data set whose records are physically in the same order in which they were put in the data set. A VSAM data set is processed by using addressed direct access or addressed sequential access and has no index. New records are added at the end of the data set.
(2) A data set whose records are loaded without respect to their contents, and whose relative byte addresses cannot change. Records are retrieved and stored by addressed access, and new records are added at the end of the data set.
 entry thread
A thread which is used by the CICS DB2 attachment facility for transactions with special requirements, such as high priority transactions, or transactions with special accounting needs. See also command thread, pool thread.
 entry-type attribute
Any value that a user enters for a project. An entry-type attribute can be configured with a default value, which users can accept or replace as they create or modify requirements. See also attribute type, attribute value, list-type attribute.
 enum constant
See enumeration constant.
 enumerated list
A set of DB2 objects that are defined with a LISTDEF utility control statement in which pattern-matching characters (*, %;, _, or ?) are not used.
 enumeration
A model element in class diagrams that represents user-defined data types. See also enumeration literal.
 enumeration constant (enum constant)
In the C or C++ language, an identifier, with an associated integer value, defined in an enumerator. An enumeration constant may be used anywhere an integer constant is allowed.
 enumeration data type
In the Fortran, C, and C++ language, a data type that represents a set of values that a user defines.
 enumeration literal
A model element in a class diagram that represents a named value in an enumeration. See also enumeration.
 enumeration tag
The identifier that names an enumeration data type.
 enumeration type
A data type that defines a set of enumeration constants. In the C++ language, an enumeration type is a distinct data type that is not an integral type.
 enumerator
An enumeration constant and its associated value.
 envelope
(1) A string of data representing information about a message aside from the attachments and its recipients.
(2) A control structure containing documents.
 envelope type
A value used to define the format and contents of an envelope, so that the programs that work with specific types of envelopes are supported. The envelope types supported on a system are defined when the mail server framework is configured. The value associated with an envelope type must be a unique type value.
 environment
(1) The settings for shell variables and paths set when the user logs in. These variables can be modified later by the user.
(2) A named collection of logical and physical resources used to support the performance of a function.
(3) A structure within the message tree that is user-defined, and that can contain variable information that is associated with a message while it is being processed by a message flow.
(4) A specific instance of a configuration of hardware and software.
 environmental data
Data that the storage control must report to the host. The data can be service information message (SIM) sense data; logging-mode sense data; an error condition that prevents completion of an asynchronous operation; a statistical counter overflow; or physical information, such as power supply voltages, air flow and temperature sensors.
 Environmental Record Editing and Printing (EREP)
The program that formats and prepares reports from the data contained in the error recording data set.
 environment clause
In COBOL, a clause that appears as part of an Environment Division entry.
 Environment Division (ED)
One of the four main parts of a COBOL program. The Environment Division describes the computers on which the source program is compiled and those on which the object program is run; it also provides a connection between the logical concept of files and their records, and the physical characteristics of the devices on which files are stored.
 environment handle
A handle that identifies the global context for database access. All data that is pertinent to all objects in the environment is associated with this handle.
 Environment Services System Services (ESSS)
A component of CICSPlex SM that implements the formal MVS/ ESA subsystem functions required by the product. ESSS provides cross-memory services, data space management, connection services, and lock management. An ESSS system address space is created at CICSPlex SM initialization and remains in the MVS image for the life of the IPL.
 environment variable
(1) A variable that defines an aspect of the operating environment for a process. For example, environment variables can define the home directory, the command search path, the terminal in use, or the current time zone.
(2) A variable that is included in the current software environment and is therefore available to any called program that requests it.
(3) A variable that specifies how an operating system or another program runs, or the devices that the operating system recognizes.
 EOB
See end of block.
 EOC
See end-of-chain.
 EOF
See end-of-file.
 EOJ
See end of job.
 EOM
(1) See end of memory.
(2) See end-of-message.
 EOS
See end-of-segment.
 EOT character
See end-of-transmission character.
 EOT marker
See end-of-tape marker.
 EP
See Error Protocol.
 EPI
See external presentation interface.
 epilog
Code generated at the end of a routine, normally causing a return to the caller of the routine.
 EPLPA
See extended pageable link pack area.
 EPO
See emergency power off.
 EPOC
An operating system designed for mobile devices.
 epoch
The time and date corresponding to 0 in an operating system's clock and time-stamp values. For most versions of the UNIX operating system, the epoch is 00:00:00 GMT, 01 January 1970. System time is measured as the number of seconds past the epoch.
 epoch time stamp
In the DCE Cell Directory Service (CDS), a timestamp that identifies directory replicas as being part of the same set. CDS uses the epoch timestamp when it performs a skulk operation on a directory.
 E_port
See expansion port.
 EPP
See end-to-end probe platform.
 EPR
See endpoint reference.
 EPROM
See erasable programmable read-only memory.
 EPS
See extended pointer set.
 EPST
See extended partition specification table.
 EPVT
See error processor vector table.
 EQE
See error queue element.
 equality matching technique
A method of performing a table lookup in which a column from the primary input link is required to match a column from the reference input link.
 equate name
In Interactive Source Debugger, a shorter name assigned to a command that is used often. The equate name, when called, performs the same function as the command.
 equijoin
A join operation in which the join condition has the form expression = expression. See also join.
 equipment check
An asynchronous indication of a printer malfunction.
 equivalence class
(1) A grouping of characters or character strings that are considered equal for purposes of collation. For example, many languages place an uppercase character in the same equivalence class as its lowercase form, but some languages distinguish between accented and unaccented character forms for the purpose of collation.
(2) A classification of values for which an object is expected to behave similarly.
 equivalence partition
See equivalence class.
 equivalent
In an XRF environment, the mutual attribute of any two DBCTL subsystems that are members of the same RSE. See also recoverable service element, recoverable service table.
 equivalent paths
A collection of paths to a storage device. The paths have no switchover time penalty when changing from one path group to another while accessing the storage device.
 ER
See exception response.
 erasable programmable read-only memory (EPROM)
A type of memory chip that can retain its contents without electricity. Unlike the programmable read-only memory (PROM), which can be programmed only once, the EPROM can be erased by ultraviolet light and then reprogrammed.
 erase-on-scratch
A Resource Access Control Facility (RACF) and DFSMSdfp function that overwrites the space occupied by a data set when the data set is deleted (scratched) from a direct access storage device (DASD) or part of the space is released.
 ERDS
See error-recording data set.
 ERDSA
See extended read-only dynamic storage area.
 EREP
See Environmental Record Editing and Printing.
 ERP
(1) See error recovery procedure.
(2) See enterprise resource planning.
 error
A discrepancy between a computed, observed, or measured value or condition and the true, specified, or theoretically correct value or condition. See also failure.
 error code
A value that identifies an error condition.
 error condition
The state that results from an attempt to run instructions in a computer program that are not valid or that operate on data that is not valid.
 error correction code (ECC)
A code appended to a data block that has the capability to detect and correct multiple bit errors within the block.
 error detect timeout value (E_D_TOV)
The time that a switch waits for an expected response before declaring an error condition. This value is adjustable in 1 microsecond increments from 2 - 10 seconds. See also resource recovery timeout value.
 error ID
See error identifier.
 error identifier (error ID)
A value used to identify a unique error condition detected by the hardware or device.
 error log
A record of machine checks, device errors, and media statistics.
 error log stream
A continuous flow of error information that is transmitted using a predefined format.
 error message
Any message displayed by DirectTalk in the System Monitor as an alarm and optionally written to the DirectTalk error log, or to the AIX error log (as an alert). Strictly speaking, the term error message should include only red (immediate attention) and yellow (problem situation) messages but it is also used to refer to green (a red or yellow message has been cleared) and white (informational) messages.
 error page range
A range of pages that is considered to be physically damaged.
 error processor vector table (EPVT)
A table containing addresses of the error group processors invoked by the routing mechanism of the node error program.
 Error Protocol (EP)
A protocol that provides a means for an Internetwork Packet Exchange (IPX) system to report that is has detected an error, and as a result of that error, the IPX system has discarded an IPX packet.
 error queue element (EQE)
A piece of data that is maintained for a Fast Path area data set block that cannot be accessed. Each data set can have up to ten damaged blocks (control intervals).
 error-recording data set (ERDS)
On S/390 and zSeries hosts, a data set that records data-storage and data-retrieval errors. A service information message (SIM) provides the error information for the ERDS.
 error recovery procedure (ERP)
A procedure designed to help isolate and, where possible, to recover from errors in equipment. The procedure is often used in conjunction with programs that record information on machine malfunctions.
 error status block (ESB)
A recording area in a node error block (NEB) of the node error table.
 error status element (ESE)
In the terminal error block of the terminal error table, a field that records occurrences of a particular type of error associated with a terminal.
 ESA
See Enterprise Systems Architecture.
 ESA/390
See Enterprise Systems Architecture/390.
 ESAF
See External Subsystem Attach Facility.
 ESA mode
An operation mode of the supervisor (generated with MODE=ESA) of a VSE system. Such a supervisor will run on a 370-XA or Enterprise Systems Architecture processor and provides support for multiple virtual address spaces, the channel subsystem, and more than 16MB of real storage.
 ESB
(1) See error status block.
(2) See enterprise service bus.
 ESB server
An application server that provides the execution environment for mediation modules in addition to application programs.
 ESC
(1) See escape character.
(2) See exception symptom code.
 escalation
A course of action that runs when a task is not completed satisfactorily within a specific period of time. See also escalation limit.
 escalation limit
The amount of time, for example hours or days, that a participant has to respond to a request, before an escalation occurs. See also escalation.
 escalation participant
In identity management, a person that has the authority to respond to requests that participants do not respond to within the specified escalation time. An escalation participant can be identified as an individual, as a role, or by using a custom JavaScript script.
 escape
To return to the original level of a user interface.
 escape character (ESC)
(1) A symbol that is used to modify the interpretation of the character or characters that follow it. Examples of uses of escape characters in SQL are delimiting identifiers, delimiting character constants, and modifying the special meaning of the underscore (_) and percent (%) characters in the LIKE predicate.
(2) A character that suppresses or selects a special meaning for one or more characters that follow.
(3) The control character in a text-control sequence that indicates the beginning of a sequence and the end of any preceding text.
 escape message
A message that reports a condition that caused the program to end before the requested function was complete.
 escape sequence
(1) A string of bit combinations that is used to escape from normal data, such as text code points, into control information.
(2) A character that is preceded by a \ (backslash) and is interpreted to have a special meaning to the operating system.
(3) A sequence of characters that contains the \ symbol followed by one of the characters: a ,b ,f ,n ,r ,t ,v ,' , ,x ,\ , or by one or more octal or hexadecimal digits.
 ESCD
(1) See extended system contents directory.
(2) See ESCON Director.
 ESCM
See ESCON Manager.
 ESCON channel
An S/390 or zSeries channel that supports ESCON protocols.
 ESCON Director (ESCD)
A class of devices that connect channels and control units only for the duration of an input/output (I/O) operation. See also ESCON Manager.
 ESCON host system
An S/390 or zSeries host that attaches to the ESS with an ESCON adapter. ESCON host systems run on operating systems that include MVS, Virtual Storage Extended (VSE), transaction processing facility (TPF), or versions of VM.
 ESCON Manager (ESCM)
A licensed program that provides host control and intersystem communication capability for ESCON Director connectivity operations. See also ESCON Director.
 ESCON multiple image facility (EMIF)
In mainframe computing, a function that enables logical partitions (LPARs) to share an ESCON channel path by providing each LPAR with its own channel-subsystem image.
 EsconNet
In ESS Specialist, the label on a pseudo-host icon representing a host connection that uses the ESCON protocol and that is not completely defined on the ESS. See also access-any mode, anonymous host.
 ESD
See electrostatic discharge.
 ESDS
See entry-sequenced data set.
 ESDSA
See extended shared dynamic storage area.
 ESE
See error status element.
 ESI
(1) See Edge Side Include.
(2) See external security interface.
 ESI processor
A feature in the WebSphere Web server plug-in that supports fragment caching and fragment assembly into full pages.
 ESM
See external security manager.
 ESN
See electronic serial number.
 esoteric unit name
An installation-assigned name for a group of devices having similar hardware characteristics; this name is used when requesting a device. For example, an esoteric unit name of TAPE might represent all tape devices in an installation. See also generic unit name.
 ESP
See Encapsulated Security Payload.
 ESQA
See extended system queue area.
 ESQL
See extended SQL.
 ESQL data type
A characteristic of an item of data that determines how that data is processed. ESQL supports six data types (boolean, datetime, null, numeric, reference, and string). Data that is retrieved from a database or is defined in a message model is mapped to one of these basic ESQL types when it is processed in ESQL expressions.
 ESQL field reference
A sequence of period-separated values that identify a specific field (which might be a structure) within a message tree or a database table. The path from the root of the information to the specific field is traced using the parent/child relationships. An example of a field reference might be something like Body.Invoice.InvoiceNo.
 ESQL function
A single ESQL expression that calculates a value from a number of given input values. The function can take input parameters but has no output parameters; it returns the value that results from the implementation of the expression to the caller. The ESQL expression can be a compound expression such as BEGIN END.
 ESQL module
A sequence of declarations that define MODULE-scope variables and their initialization, and a sequence of subroutine (function and procedure) declarations that define a specific behavior for a message flow node. A module must begin with the CREATE node_type MODULE statement and end with an END MODULE statement. The node_type must be one of COMPUTE, DATABASE, or FILTER. The entry point of the ESQL code is the MODULE scope procedure named MAIN.
 ESQL procedure
A subroutine that has no return value. It can accept input parameters from and return output parameters to the caller.
 ESQL variable
A local temporary field that is used in processing a message.
 ESS (TotalStorage Enterprise Storage Server)
See IBM TotalStorage Enterprise Storage Server.
 ESS Copy Services
A collection of optional software features, with a Web-browser interface, used for configuring, managing, and monitoring data-copy functions.
 ESSS
See Environment Services System Services.
 ESTAE
See extended specify task abnormal exit.
 estimate at completion (EAC)
An earned value term used to describe the expected total cost of an activity, group of activities or the project when the defined scope of work has been completed.
 estimate to complete (ETC)
The expected additional cost needed to complete an activity, a group of activities, or a project.
 ETB character
See end-of-transmission-block character.
 ETC
See estimate to complete.
 E-TDMA
See extended time division multiple access.
 ETFF
See eject to front facing.
 Ethernet
A packet-based networking technology for local area networks (LANs) that supports multiple access and handles contention by using Carrier Sense Multiple Access with Collision Detection (CSMA/CD) as the access method. Ethernet is standardized in the IEEE 802.3 specification.
 Ethernet network
A baseband local area network (LAN) with a bus topology in which messages are broadcast on a coaxial cable using a carrier sense multiple access/collision detection (CSMA/CD) transmission method.
 ETL
See extract, transform, and load.
 ETO
See Extended Terminal Option.
 ETO descriptor
A template that contains information about the physical characteristics of terminals, user options and message queue names, and remote LTERMs associated with MSC links. See also logon descriptor, MFS device descriptor, MSC descriptor, user descriptor.
 ETR
(1) See external throughput rate.
(2) See external time reference.
 ETS
See European Telecommunications Standard.
 ETSI
See European Telecommunications Standards Institute.
 ETX character
See end-of-text character.
 EUC
(1) See Extended UNIX Code.