Creates a MODEM Connect Line.  The line name, communications mode,
    communication port, duplex, and profile are required arguments.

    LINE NAME
       Name to associate to this line.

    COMMUNICATIONS MODE
       Communications method used on the link.  This argument determines the
       value of the communications mode characteristic.  The default value is
       taken from the device capability.  If that is unknown the default is
       synchronous.

    COMMUNICATION PORT
       Name of the communications port to which the communications line is
       connected.  This argument determines the value of the communications port
       characteristic.

    DUPLEX
       Specifies whether the line is full-duplex or half-duplex.  This argument
       determines the value of the duplex characteristic.

    MODE
       The method of startloop used on this line.

    Press the CONTINUE button to create the MOP Circuit entity, or press
    the CANCEL button to cancel this operation.  In either case, you will
    return to the main window.