Program Control Program (PCP) is used support program call function in CICS. CICS supports LINK API which allow one program to call another program. The callee returns to the caller when finished. XCTL pass control to another program of the same level and there is not return from the callee. LOAD allows a program to load another load module (table, map etc) into memory. PCP also support abend handler (HANDLE ABEND) which percolate control up program levels when a program encountered an abend.
CICS PCP functions allow related program to call each other dynamically. Related programs does not need to be linked into a big module. PCP also allocate separate working storage for each transaction which share the same program. PCP also saves and restores program related fields in TCA.
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