Advanced Poll - how to prevent users from voting twice

Hello everyone,
I need some help here. I've installed Advanced Poll and it works great. I also enable both IP and cookie to prevent double-voting. The problem here is that the same person use a different computer to submit her vote; and the system registers it. Is there a good way to prevent this kind of problem? Thanks.javascript:emoticon('

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Sad
PL

I know this is an old topic, but how many people would bother to log on a different computer and vote? Not many. Theres such a small population of people who would do that.

I'm guessing you're trying to get precise results, but reality is the results will always have a standard deviation. Don't even bother. I'm 99.9% sure you can't do that anyway.