INT 2F C - DESQview v2.26+ External Dev Interface - DV TERMINATION              
	AX = DE03h
	BX = mapping context of DESQview
	DX = handle of DESQview system task
Notes:	driver should pass this call to previous handler before doing its work
	DESQview makes this call when it is exiting, but before unhooking any
	  interrupt vectors
SeeAlso: AX=DE02h,AX=DE0Fh,INT 15/AX=5407h