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INT 2F - Multiplex - Communicating Applications Spec - FIND FIRST QUEUE ENTRY
        AX = CB05h
        CX = status of events to find
            0000h successful completion
            0001h waiting to be processed
            0002h number has been dialed
            0003h connection established, sending
            0004h connection established, receiving
            0005h even aborted
            FFFFh find any event, regardless of status
            other negative values, match error code
        DH = direction
            00h chronological order, earliest to latest
            01h reverse chronological order, latest to earliest
        DL = queue to search
            00h task queue
            01h receive queue
            02h log queue
Return: AX = 0000h successful
            BX = event handle for found event
           < 0     error code (see AX=CB01h)
SeeAlso: AX=CB06h