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21FF

Category: DOS extenders
Flags: Undocumented function, available only in protected mode

INT 21 - Rational Systems DOS/4GW - API

	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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