Category: <b>keyboard enhancers</b>
<br>Flags: partially documented function<p>
<pre><b>INT 2F - MS-DOS 3.3+ KEYB.COM internal - INSTALLATION CHECK</b>

	AX = AD80h
Return: AL = FFh if installed
	    BX = version number (BH = major, BL = minor)
	    ES:DI -&gt; internal data (see <a href=../../it/72/29.html>#02972</a>)
	    AH destroyed (set to FFh by some implementations/versions)
Notes:	MS-DOS 3.30, PC-DOS 4.01, MS-DOS 5.00, and MS-DOS 6.22 all report
	  version 1.00.
	this function was undocumented prior to the release of DOS 5.0
	most versions of KEYB completely replace the BIOS INT 09 handler, but
	  Novell DOS's KEYB partially uses the BIOS code and thus continues
	  to chain to the original INT 09 at times
	some utilities check for AX=FFFFh on return
SeeAlso: AX=AD80h"Novell",AX=AD81h,AX=AD82h,AX=AD83h

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