This section describes previous APPC/MVS system service calls that have been replaced by newer versions. The newer versions are documented in APPC/MVS System Services Summary. These previous versions remain valid in later releases but contain no enhancements.

Callers of these system services must be in supervisor state or PSW key 0-7. Callers that are not in supervisor state or PSW key 0-7 end with system completion (abend) code 0C2, with the exception of ATBMIGRP, which provides a return code.