INT 61 - Banyan VINES - ASYNC TERMINAL EMULATION - START/STOP TRACING TRAFFIC
        AX = 0003h subfn 13h
        DS:BX -> argument block (see below)
Return: AX = status (see AX=0003h/SF=00h)
SeeAlso: AX=0003h/SF=00h,AX=0003h/SF=0Eh

Format of argument block:
Offset  Size    Description
 00h    BYTE    session ID (00h)
 01h    BYTE    13h (function "start/stop tracing data traffic in session")
 02h    BYTE    trace flag (00h=off, 01h=on)

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