Category: <b>mouse/pointing device</b>
<p>
<pre><b>INT 33 - Mouse Systems MOUSE DRIVER - POPUP.COM - INSTALLATION CHECK</b>

	AX = 0070h
	BX = ABCDh
Return: AX = ABCDh if installed
	    BX:CX -&gt; data structure (see <a href=../../it/88/31.html>#03188</a>)
Notes:	this function is also supported by the Genius Mouse 9.06 driver
	the v7.01 POPUP.COM and menu drivers also check for the signature
	  CDh ABh BAh DCh at offset -2Ch from the interrupt handler
	if POPUP is not loaded, the returned data structure contains the proper
	  signature at offset 00h, but not at offset 08h

</pre>