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|Programming Interfaces Guide Oracle Solaris 11.1 Information Library|
UNIX domain sockets are named with UNIX paths. For example, a socket might be named /tmp/foo. UNIX domain sockets communicate only between processes on a single host. Sockets in the UNIX domain are not considered part of the network protocols because they can be used to communicate only between processes on a single host.
Socket types define the communication properties visible to a user. The Internet domain sockets provide access to the TCP/IP transport protocols. The Internet domain is identified by the value AF_INET. Sockets exchange data only with sockets in the same domain.