You can invoke authorized programs by using the SELECT service, a selection panel, a command table, or by using the TSO CALL command under ISPF. ISPF uses the TSO Service Facility IKJEFTSR to invoke authorized commands and programs. Authorized programs are invoked under the TSO TMP (Terminal Monitor Program) and therefore should not reside in the ISPLLIB library. Authorized programs cannot issue dialog service requests. See z/OS TSO/E Customization for information about adding authorized programs and commands to the list maintained by your installation.