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Starting with version 3.1 of @command{gawk}, @command{awk} programs can open a two-way TCP/IP connection, acting as either a client or server. This is done using a special file name of the form:
`/inet/protocol/local-port/remote-host/remote-port'
The protocol is one of `tcp', `udp', or `raw', and the other fields represent the other essential pieces of information for making a networking connection. These file names are used with the `|&' operator for communicating with a coprocess (see section Two-Way Communications with Another Process). This is an advanced feature, mentioned here only for completeness. Full discussion is delayed until @ref{TCP/IP Networking, ,Using @command{gawk} for Network Programming}.
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