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Humans vs. Non-humans

How to tell the difference?

5:15 am on Mar 8, 2005 (gmt 0)

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joined:Sept 12, 2003
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I sell CPM & CPC advertising on my site, and I don't want to charge for nonhuman "traffic". To distinguish, I currently just look for common browser names in the user agent. Does anyone know of a better way? (I'm running Coldfusion, so a CF solution would be ideal.)