[arch-general] The principle behind MSN & Yahoo invisible scanners?

F. Gr. fgr at anche.no
Sun Aug 29 04:13:38 EDT 2010

2010-08-28 22:54 +0530, Nilesh Govindarajan:

>   Go to google.com and search for MSN & Yahoo invisible scanners.
> You'll find a big list.
> So what's the principle of their working?

A while ago I heard the following:

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