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| <h3 class="section">16.7 Other Namespaces</h3> |
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| <p><a name="index-PF_005fNS-1767"></a><a name="index-PF_005fISO-1768"></a><a name="index-PF_005fCCITT-1769"></a><a name="index-PF_005fIMPLINK-1770"></a><a name="index-PF_005fROUTE-1771"></a>Certain other namespaces and associated protocol families are supported |
| but not documented yet because they are not often used. <code>PF_NS</code> |
| refers to the Xerox Network Software protocols. <code>PF_ISO</code> stands |
| for Open Systems Interconnect. <code>PF_CCITT</code> refers to protocols from |
| CCITT. <samp><span class="file">socket.h</span></samp> defines these symbols and others naming protocols |
| not actually implemented. |
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| <p><code>PF_IMPLINK</code> is used for communicating between hosts and Internet |
| Message Processors. For information on this and <code>PF_ROUTE</code>, an |
| occasionally-used local area routing protocol, see the GNU Hurd Manual |
| (to appear in the future). |
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