The MVS™ router provides an optional installation exit that is invoked whether or not RACF® or another external security product is installed and active on the system. If an external security product is not available, the router exit acts as an installation-written security processing (or routing) routine. If an external security product is available, the exit acts as an external security product preprocessing exit.
For more information on the MVS router exit, see z/OS MVS Installation Exits.