RDEFINE STARTED (CICSTASK.CICSDA*) STDATA( USER=(CICSDA##) )
When you issue the START command to start CICSTASK with a job name of, say, CICSDAA1, MVS™ passes the procedure name (CICSTASK), and the job name (CICSDAA1) in order to obtain the userid under which this CICS application-owning region is to run. In the example shown above, the CICS region userid is defined as CICSDA##, for all regions started under the generic profile CICSTASK.CICSDA*.