REXX/CICS can be viewed as a more sophisticated version of the CICS-supplied Command Level Interpreter Transaction (CECI). The REXX transaction (used to issue REXX execs), much like the CECI transaction, can be controlled using CICS transaction security. The REXX transaction might be made widely available, or might be limited to a few individuals, depending upon the nature of the CICS region it is running in.