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Layer 7 of the OSI
reference model. This layer provides services to application processes such as
electronic 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 Systems Network
Architecture (SNA) model. See also data link layer, network
layer, physical layer, presentation layer, session
layer, and transport layer.
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