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

INT 21 - Rational Systems DOS/4GW - GET/SET ???

	AH = FFh
	DH = 0Ch
	DL = ??? (00h or 01h)
Return: CF clear if successful
	    AL = previous value of ???
	CF set on error (DL out of range)
	    AX = FFFFh

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