INT 79 R - AutoCAD Device Interface - DIGITIZER - GET DIGITIZER STATUS          
	AX = 0003h
Return: AX = status
	    0000h nothing
	    0002h tracking point (no button pressed)
		BX = X coordinate
		CX = Y coordinate
	    0003h picked point (button 0,A,B,C,D pressed)
		BX = X coordinate
		CX = Y coordinate
	    0004h button pick
		BX = button number
	    0005h button and coordinates
		BX = button number
		CX = X coordinate
		DX = Y coordinate
SeeAlso: AX=0001h,AX=0002h