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

	AX = 5454h
Return: AX = 0000h if resident
SeeAlso: AX=50FDh"VIRUS",AH=54h/BX=4475h"VIRUS",AX=7BCEh"VIRUS"
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