Using Advanced Program-to-Program Communication › Advanced Program-to-Program Communication (APPC)

Advanced Program-to-Program Communication (APPC)

The SNA APPC is a high-level application programming interface that allows program-to-program communications and the development of distributed applications between network nodes that support Logical Unit type 6.2 (LU6.2). LU type 6.2 communication facilities form the basis for SAA's Common Programming Interface for Communications (CPI-C).

In this implementation of APPC, the high-level application programming interface is provided by the NCL &APPC verb which provides access to a full set of LU6.2, or APPC, programming capabilities.

These facilities let an NCL procedure communicate with another APPC application in a structured manner as defined by the LU6.2 protocol. The partner application can exist within the same, or a remote system, or any other application system that supports LU6.2 protocols.

In addition, this implementation of APPC supports a number of extensions that assist the development of client/server applications within NCL or spanning other APPC platforms.

Before writing NCL procedures that use these APPC facilities, you should familiarize yourself with the fundamental APPC concepts and implementation procedures. For more information, see the Reference Guide. In addition, see IBM's Communications Server SNA Programmer's LU 6.2 Reference, which is the authoritative source for detailing the LU6.2 verb set.