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

	AH = 30h
	DX = ABCDh
Return: DX = DCBAh if installed
SeeAlso: AX=0D20h,AH=30h/SI=1234h,AX=3000h"VIRUS",AX=30F1h
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