Category: <b>virus/antivirus</b>
<p>
<pre><b>INT 21 - VIRUS - "SVC 5.0" or "SVC 6.0" - INSTALLATION CHECK</b>

	AH = 84h
Return: DX = 1990h if resident
	    BH = version number (major in high nybble, minor in low)
SeeAlso: AH=83h"VIRUS",AH=89h"VIRUS"
</pre>