Int 21/AX=4410h

DOS 5+ - IOCTL - QUERY GENERIC IOCTL CAPABILITY (HANDLE)

AX = 4410h
BX = handle for device
CH = category code (see #01545)
CL = function code (see #01546)

Return:
CF clear if successful
AX = 0000h  specified IOCTL function is supported
CF set on error
AL = 01h    IOCTL capability not available

Note: A program which wishes to use Generic IOCTL calls beyond those in the standard DOS 3.2 set may use this call first to see whether a particular call is supported

See Also: AX=440Ch - AX=440Dh"DOS 3.2+" - AX=4411h

Category: DOS Kernel - Int 21h - D

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