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21FF--DH12

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

INT 21 - Rational Systems DOS/4GW - EXCHANGE ??? POINTERS

	AH = FFh
	DH = 12h
	DS:SI -> new ???
	ES:DI -> new ???
Return: DS:SI -> previous ???
	ES:DI -> previous ???

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