INT 2F - Communicating Applications Specification - GET QUEUE STATUS
        AX = CB11h
        DL = queue to get status of
            00h task queue
            01h receive queue
            02h log queue
            03h send events (v1.2+)
            04h receive events (v1.2+)
Return: AX >= 0  total number of changes made to queue, modulo 32768
                BX = number of control files currently in queue
                CX = number of received files (zero for task and log queues)
        AX < 0  error code (see AX=CB01h)