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(libc.info)Misc Namespaces

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Other Namespaces
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   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).