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21FF--DH10

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

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

	AH = FFh
	DH = 10h
	AL = ???
	BX = ???
	CX = ???
	DI = ???
	SI = ???
Return: ???
Note:	among other things, frees two memory blocks via INT 21/AH=49h

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