Category: <b>DESQview/TopView and Quarterdeck programs</b>
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<pre><b>INT 2F - DESQview v2.26+ External Device Interface - DRIVER CUSTOM SUBFUNCTION</b>

	AX = DE01h
	BX = driver ID
	other registers as needed by driver
Notes:	XDI drivers should pass this call through to previous handler if ID
	  does not match
	DESQview never calls this function
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