INT 61 - Banyan VINES - ASYNC TERMINAL EMULATION - "CONTROL MONITOR"
        AX = 0003h subfn 02h
        DS:BX -> argument block (see below)
Return: AX = status (see AX=0003h/SF=00h)
SeeAlso: AX=0003h/SF=03h,AX=0003h/SF=05h

Format of argument block:
Offset  Size    Description
 00h    BYTE    session ID (00h)
 01h    BYTE    02h (function "control monitor")
 02h    BYTE    display flag
                00h don't display data received from host
                01h display data

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