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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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