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