Int 21 Fn 4410  - DOS 5+ - Ioctl - Query Generic Ioctl Capability (handle  [D]

   AX = 4410h
   BX = handle for device
   CH = category code (see AX=440Ch)
   CL = function code

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,AX=4411h