APPC
(Advanced Program-to-Program Communications) A high-level protocol from IBM that allows one program to interact with another across the network. It supports client/server and distributed computing by providing a common programming interface on all IBM platforms. APPC provides commands for managing a session, sending/receiving data and transaction security and integrity (see two-phase commit).
APPC and LU 6.2
APPC software is either part of, or optionally available, on all IBM and many non-IBM operating systems. Since APPC has only supported SNA, which utilizes the LU 6.2 protocol for session establishment, APPC and LU 6.2 have been considered synonymous.
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