The APPC/MVS interfaces are written as callable services. They are grouped according to the class of programs that are likely to use the interfaces.

TP Conversation Services

Provide access to all APPC conversation functions. This set of services, used by transaction programs, has equivalent VTAM LU 6.2 verbs and CPI Communication calls.

Advanced TP Services

Provide access to more advanced transaction program interfaces, such as those used by TPs with a schedule type of Multi-trans.

Allocate Queue Services

Provide access to LU 6.2 server functions, which allow you to direct inbound allocate requests to server address spaces. These services have no equivalent SNA LU 6.2 services or CPI Communications routines. The APPC/MVS allocate queue services are documented in z/OS MVS Programming: Writing Servers for APPC/MVS.

System Services

Provide access to system services not normally used by transaction programs, but used by other MVS components, management subsystems, and transaction schedulers. The APPC/MVS System services are documented in z/OS MVS System Messages, Vol 3 (ASB-BPX).