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Software > Host Transaction Processing > REXX for CICS System requirements REXX for CICS CICS Transaction Server for z/OS V 2.3 CICS Transaction Server for z/OS V3.1    Operating System Software Hardware MVS/ESA CICS/ESA Version 4 Any ESA/390-capable processing system that supports MVS/ESA REXX for CICS only uses 24-bit virtual storage for partitioned data set (PDS) input/output processing.