APPC - Lingo
Advanced Program-to-Program Communication. IBM SNA system
software that allows high-speed communication between programs on
different computers in a distributed computing environment. APPC
establishes and tears down connections between communicating
programs, and consists of two interfaces, a programming interface and a
data-exchange interface. The former replies to requests from programs requiring communication; the latter establishes sessions between
programs. APPC runs on LU 6.2 devices. See also LU 6.2.