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Advanced Peer-to-Peer Networking (APPN) is part of an IBM Systems Network Architecture (SNA). It involves protocols for allowing computers to communicate between themselves, rather than being dominated by a central server or other hardware piece.
Advanced Peer-to-Peer Networking involves distributed network controls, a unique type of network topology, and dynamic networking capabilities. Some of its benefits include easier flow of network resources, automation of various registration and lookup tasks, distributed control and flexibility. The central defining characteristic of Advanced Peer-to-Peer Networking is its independence from a central hub that controls traditional systems, which is replaced by a system where one computer is designated as a network controller, and designers include routing for peer-to-peer interactions without outside influence.