User IDs for connection security

Connection type	User ID contents
Batch connection	The user ID of the connecting task. For example: The TSO user ID The user ID assigned to a batch job by the USER JCL parameter The user ID assigned to a started task by the STARTED class or the started procedures table
CICS connection	The CICS address space user ID.
IMS connection	The IMS region address space user ID.
Channel initiator connection	The channel initiator address space user ID.