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SCO TCP/IP supports sockets in the Internet and UNIX domains. A communication domain is a type of network with particular conventions such as how sockets are named and used. Sockets normally exchange data only with sockets in the same domain.
This chapter focuses on the UNIX domain only. UNIX domain sockets communicate between processes on the same system only. For Internet domain sockets, which can be used to communicate with processes on other systems, see ``Developing applications over TCP/IP using Internet sockets''.
The function netstat(TC), displays the status of any existing UNIX domain socket connections. The activity status of the user processes can be seen in the Active Connections display. If both sides of a socket pair are operating on the local machine, each is listed separately.