When you issue the MODIFY command, ICSF gives control to the installation exit CSFEXIT5, if it exists. Your installation can write an exit routine for CSFEXIT5 that changes ICSF operations. For example, you might have the installation exit change the CHECKAUTH installation option without having to stop and restart ICSF. See Installation exits for a description of the installation exits.
If your installation does not write an exit routine for CSFEXIT5, no action occurs when you enter the MODIFY command.