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If you are running Version 1, you must be running CICS Release 4.1. For all previous releases of SYSTEM 2000, the following applies:
The command-level interface was introduced with Release 12.0 of SYSTEM 2000 software.
CICS PLEX programs precompiled with R11.6 use the macro-level interface and have module S2KPLC linked with the application program.
CICS PLEX programs precompiled with R12.0 or R12.1 use the command-level interface and have module PLXPBLD linked with the application program.
Performance enhancements were made in R12.1, which means programs precompiled with R12.1 are not downward compatible. Programs precompiled with R12.0 are upward compatible, but do not take advantage of the performance enhancements.
Additional R12.1 performance enhancements were made for COBOL II (and COBOL for MVS) programs by adding the PARM='LANG=COB2' to the R12.1 precompiler step. CALLs are made directly to PLXFRMT and module PLXPBLD is not linked with the application program.