Category: <b>DOS extenders</b>
<br>Flags: Undocumented function, available only in protected mode<p>
<pre><b>INT 21 - Rational Systems DOS/4GW - API</b>

	AH = FFh
	DH = function (00h-17h) (also see separate entries below)
	DL = subfunction or argument
Return: CF clear if valid function number
	    AX = status???
	CF set if invalid function
SeeAlso: INT 15/AX=BFDCh
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