In a sysplex, when an operator uses the ROUTE command to direct a command to execute on a different system and the command installation exits are installed on both systems, both systems invoke the command installation exits. The exit on the issuing system handles the ROUTE part of the command; the command installation exit on the receiving system processes the command that ROUTE specifies. To understand the effect command routing in a sysplex has on the installation exits, see Commands in a sysplex.

The exit changes the console authority of a console only to permit the console to enter the specified command or commands coded in the exit. The original AUTH attribute of the console is still in effect and determines the ability of the console to enter any other command. Note that RACF® command profiles, if specified, override command authorization in the command authorization exits.

In a JES3 complex, use the JES3 exit IATUX18 to process JES3 commands and the MVS™ command installation exit to process MVS commands. For information on JES3 exits, see z/OS JES3 Customization.