The standard network communications software that runs on Silicon Graphics® workstations is derived from the networking software in the 4.3BSD UNIX® releases from the University of California at Berkeley and the Sun® Microsystems RPC® (remote procedure call) system. The IRIX operating system implements the Internet Protocol suite and UNIX domain sockets using the 4.3BSD UNIX socket mechanism. The system also supports access to the underlying network media by means of raw sockets.