Category: <b>DOS kernel</b>
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<pre><b>INT 21 - DOS 5+ - IOCTL - QUERY GENERIC IOCTL CAPABILITY (HANDLE)</b>

	AX = 4410h
	BX = handle for device
	CH = category code (see <a href=../../it/45/15.html>#01545</a>)
	CL = function code (see <a href=../../it/46/15.html>#01546</a>)
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
SeeAlso: AX=440Ch,AX=440Dh"DOS 3.2+",AX=4411h
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