Category: <b>virus/antivirus</b>
<p>
<pre><b>INT 21 - VIRUS - "Cascade" - INSTALLATION CHECK</b>

	AX = 4BFFh
	SI = 0000h
	DI = 0000h
Return: DI = 55AAh if installed
SeeAlso: AX=4BFFh"Justice",AX=5252h
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