Category: <b>virus/antivirus</b>
<br>Flags: callout or callback (usually hooked rather than called)<p>
<pre><b>INT 12 - CPI-standard virus - "FRIEND" CHECK</b>

	AX = 4350h
	BX = 4920h
	CX = AB46h
	DX = 554Eh
Return: if friendly (not to be infected)
	    CX:DX -&gt; ASCIZ identity code (changes yearly)
SeeAlso: INT 13/AX=EC00h"VIRUS",INT 13/AX=5001h,INT 21/AX=0B56h
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