Int 21/AX=4401h

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DOS 2+ - IOCTL - SET DEVICE INFORMATION

AX = 4401h
BX = handle (must refer to character device)
DX = device information word (see #01423)
(DH must be zero for DOS version prior to 6.x)

Return:
CF clear if successful CF set on error AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)

Note: This function was not supported by Digital Research's DOS Plus

See Also: AX=4400h - INT 2F/AX=122Bh

Category: DOS Kernel - Int 21h - D

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