INT 61 - OPTIMA 1024 VGA-Sync - QUERY APPLICATION KEY
        AX = 0007h
Return: AX = 0000h/0001h
Notes:  In specify mode, the END key has been reserved for applications.
        Returns the current toggle state of that key. E.g. in the
          OPTIMA AutoCAD driver, 0 means, AutoCAD calls subfunction 0001h
          every time the cross cursor moves.
        INT 61h is the default interrupt; the actual interrupt number can be
          obtained by calling INT 16/AH=FFh
SeeAlso: INT 61/AX=0000h"OPTIMA",INT 61/AX=0001h"OPTIMA"