X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 2+ - ioctl

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INT 21 - DOS 2+ - IOCTL - SET DEVICE INFORMATION
        AX = 4401h
        BX = device handle
        DH = 0
        DL = device information to set (bits 0-7 from function 0)
Return: CF set on error
            AX = error code (see AH=59h)
        CF clear if successful
SeeAlso: AX=4400h,INT 2F/AX=122Bh

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