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Perhaps my understanding of web bugs is lacking. I thought that they could provide:
The IP address of the computer that fetched the Web Bug
The URL of the page that the Web Bug is located on
The URL of the Web Bug image
The time the Web Bug was viewed
The type of browser that fetched the Web Bug image
A previously set cookie value
If that's the case, how does that track if someone has a dynamic IP and clears their cookies? (Isn't it really just cookie + IP?).
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