IBM Advanced Program-to-Program Communication (APPC) is a protocol developed by IBM that enables communication between programs running on different systems in a distributed computing environment. It is a part of the Systems Network Architecture (SNA) and facilitates application-to-application communication by allowing different programs to interact with each other over a network. APPC provides several key features: 1. **Session Establishment**: It allows programs on different systems to establish sessions for communication, enabling the exchange of messages and data.

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