VMS Help TCPIP Services, Programming Interfaces, Sockets API, bind(), Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    This function assigns a port number and IP address to an unnamed
    socket. When a socket is created with the socket() function, it
    exists in a name space (address family) but has no name assigned.
    The bind() function requests that a name be assigned to the
    socket.
    Related Functions
    See also connect(), getsockname(),  listen(), and socket().