CICS® VR maintains an internal trace table to help you follow the order in which the CICS VR modules are invoked before an abend.
****************
Each entry consists of these two
8-byte character strings: A trace entry with reason PROLOG is added on entry to the module. An entry with reason EPILOG is added at exit from the module.
Alternatively, you find the address of the trace table, and its end mark, in the BIB block of CICS VR. You find the address of the trace table at offset X'440' in the BIB, and the address of the end-of-trace mark at offset X'448'.