Sockets are described in Section 7.3.8. They are a nearly standard programming
interface to IP and IP transport protocols that allow applications to be written in
a portable way and run on different systems, getting the same level of access
to the IP transport. Sockets implementations themselves provide a level of
queuing of messages and buffering of data that is of great help to an application
implementer. Note that sockets implementations exist to provide access to UDP
and TCP. Direct access to IP (without the use of a transport ...
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