Call Command (Net Bios, 10h)

        This command is used to establish a session with another machine
        or process. The remote name is supplied in CALLNAME and the
        local name is specified in NAME. In addition, session data
        transfer time-outs must be specified in RTO and STO.

        A LISTEN command must be outstanding for the called (remote)
        name. When the CALL completes successfully, a session number
        (from 1 to 254) is returned in LSN. This number is used when
        sending or receiving session data, or in the HANG UP (session
        terminate) command.