Determining the userid of the CICS region

This topic contains Product-sensitive Programming Interface and Associated Guidance Information.

CICS® makes use of the userid of the region in which it runs for the following purposes:

CICS obtains the region userid by invoking the external security manager, which extracts it from the RACF® control blocks relevant for the job. The security domain and MRO-bind security each obtain the region userid by issuing a RACROUTE REQUEST=EXTRACT macro. To customize the response from this macro, and thus the security identification of a CICS region, use the MVS™ security router exit, ICHRTX00.