DOS / Functions / 44 (IOCTL) / 10

                     INT 21 - DOS 5 - QUERY IOCTL HANDLE

Input	DOS1	N	DOS2	N	DOS4	N	DOS5	Y	Output
AX	44h		10h		Error Code				AX
BX	Device Handle								BX
CX	Category Code		Function Code						CX
									DX
DS:DX	Parameter Block				Set if Error				CF

        Uses the same layout as the GENERIC call. Programs can use this
        function to determine if a device can support a GENERIC call.