Providing Format and Analysis Support

IPCS uses members of SYS1.PARMLIB or parmlib members that make up a logical parmlib concatenation to control its processing:

IPCSPRxx
BLSCECT
BLSCUSER, which is embedded in the default BLSCECT member
Other members embedded in BLSCECT

Prior to the concatenated parmlib support available with OS/390® Release 2, IPCS used an IPCSPARM data set to identify the members required for its processing. If an IPCSPARM data ser was not allocated at the time IPCS was invoked, IPCS dynamically allocated SYS1.PARMLIB for the duration of the IPCS session and unallocated it when complete.

If IPCS is running on a level of z/OS that supports concatenated parmlib and if an IPCSPARM data set is not allocated, IPCS allocates the current concatenation available and frees it when complete.