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Layer 7 of the OSI reference model. This layer provides
services to application processes (such as e-mail, file transfer, and terminal
emulation) that are outside of the OSI model. The application layer identifies
and establishes the availability of intended communication partners (and the
resources required to connect with them), synchronizes cooperating
applications, and establishes agreement on procedures for error recovery and
control of data integrity. Corresponds roughly with the transaction services
layer in the SNA model. See also data-link layer, network layer,
physical layer, PQ, session layer, and transport
layer.
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