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- That part of the API devoted to communications with other application software, external data transport facilities, and devices. The services provided are those whose protocol state, syntax, and format all must be standardized for interoperability [POSIX.0].
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- access channel, DCE, FDDI-2, Fiber Distributed Data Interface (FDDI), interface functionality, NDUB (network-determined user busy), physical plane, primary channel, radio interface, system services