6.5 Socket predicate reference
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Availability::- use_module(library(socket)).(can be autoloaded)
Source[det]tcp_connect(+SocketId, +Address)
Connect SocketId. After successful completion, tcp_open_socket/3 can be used to create I/O-Streams to the remote socket. This predicate is part of the low level client API. A connection to a particular host and port is realised using these steps: 
    tcp_socket(Socket),
    tcp_connect(Socket, Host:Port),
    tcp_open_socket(Socket, StreamPair)

Typical client applications should use the high level interface provided by tcp_connect/3 which avoids resource leaking if a step in the process fails, and can be hooked to support proxies. For example: 

    setup_call_cleanup(
        tcp_connect(Host:Port, StreamPair, []),
        talk(StreamPair),
        close(StreamPair))

If SocketId is an AF_UNIX socket (see unix_domain_socket/1), Address is an atom or string denoting a file name.