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This APPC is expanded as Advanced Program-to-Program Communication, sometimes called LU 6.2, it is a communication protocol and also a programming interface standard which operates in the presentation layer where this layer that ensures that messages are in the proper format for the recipient and the session layer (the layer responsible for setting up and taking down the association of the two end points in a connection) of the Open Systems Interconnection (OSI) communications model. This was Originally developed by IBM as a remote transaction processing tool, Now APPC they are used to provide distributed services within a heterogeneous computing environment.