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

    Creates an endpoint for communication by returning a special
    kind of file descriptor called a socket descriptor, which is
    associated with a TCP/IP Services socket device channel.
    The $QIO equivalent is the IO$_SETMODE function.
    Format
      #include  <types.h>
      #include  <socket.h>
      int socket  ( int af, int type, int protocol );

  Additional Information (explode) :

• Arguments
• Description
• Return Values
• Errors