APPC/MVS System Services Summary

This chapter describes the specific system services available in APPC/MVS. The function, invocation requirements, parameters, and other detailed information are explained separately for each system service.

Callers of these system services must be in supervisor state or have a PSW key of 0-7. Callers that are not in supervisor state or do not have PSW key 0-7 end with system completion (abend) code 0C2, with the exceptions of the Join_Sysappc_Group and Set_Address_Space_Attributes services, which provide a return code.

The ATBCSS module from SYS1.CSSLIB must be link-edited with any program that issues these services.

The following table lists the system services that have more than one associated call name. This chapter describes the current versions of the calls, which are the preferred programming interfaces for these services. The previous versions are described in Previous Versions of APPC/MVS System Services.

Table 1. APPC/MVS System Callable Services
Service Name	Previous Call Name	Current Call Name	Reference for Current Call
Cleanup_Address_Space	ATBCMAS	ATBCAS1	ndeall.htm#ndeall__atbcmas
Cleanup_TP	ATBCMTP, ATBCTP1	ATBCTP3	tsctp.htm#tsctp__atbcmtp
Identify	ATBIDEN, ATBIDN1	ATBIDN4	nident4.htm#nident4__atbidn4
Join_Sysappc_Group	ATBMIGRP	ATBJGP1	njtsg.htm#njtsg__atbjoin
Unidentify	ATBUNID	ATBUID1	nunid.htm#nunid__atbunid