ICSF calls this exit during initialization just before calling the ICSF mainline exit CSFEXIT. You can use this exit to anchor resource lists, work areas, and other data to the security communication area. The security service exit (CSFESECS) and security key exit (CSFESECK) can be used to control access to resources on ICSF and for logging in SMF the results of any authorization checks that are made. The security initialization exit defined in the options data set is only invoked if CSFESECS, CSFESECK, or both are also defined.