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This is Layer 7
in the Systems Network Architecture (SNA) architectural model. This layer
represents user application functions, such as spreadsheets, word-processing,
or electronic mail, by which users interact with the network. Corresponds
roughly with the application layer of the OSI reference model. See also
data flow control layer, data link control layer, path control layer,
physical control layer, presentation services layer, and transmission
control layer.
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