INT 2F C - DESQview v2.26+ External Dev Interface - SAVE STATE                  
	AX = DE08h
	BX = mapping context of task being switched from
	      (see #00416 at INT 15/AX=1016h)
	DX = handle of task being switched from
Notes:	invoked prior to task swap, interrupts, etc
	driver should pass this call to previous handler after processing it
SeeAlso: AX=DE09h,INT 15/AX=5403h,INT 15/AX=DE27h