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16.7 Other Namespaces

Certain other namespaces and associated protocol families are supported but not documented yet because they are not often used. PF_NS refers to the Xerox Network Software protocols. PF_ISO stands for Open Systems Interconnect. PF_CCITT refers to protocols from CCITT. socket.h defines these symbols and others naming protocols not actually implemented.

PF_IMPLINK is used for communicating between hosts and Internet Message Processors. For information on this and PF_ROUTE, an occasionally-used local area routing protocol, see the GNU Hurd Manual (to appear in the future).