Click bots / Click fraud

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Click bots and cheat bots is something you always hear about in verious PTR and PTC program - but what are they really? Have you ever seen one? I would love to get my hands on one - not to use it of course, that's not fair to the program, but I'm very interested in the source code for running through the emails. Anyone know here I could get my hands on something like that? Preferably written in PHP.