An IBM Systems Network Architecture communications method that uses the LU 6.2 protocol to establish, manage, and terminate network communication between programs in a distributed computing environment.

A series of interprogram communication services that support distributed transaction processing, as provided by LU 6.2.

A communications architecture that allows transaction programs to exchange information on a peer-to-peer basis. SNA LU 6.2 allows APPC architecture to operate on an SNA network.

An implementation of the Systems Network Architecture (SNA) and synchronous data link control (SDLC) LU 6.2 protocol that allows interconnected systems to communicate and share the processing of programs. APPC allows CallPath Server to control and influence the actions of a switch through the SwitchServer/2 protocol converter.