if you are using a database, then use the voter's I
address as the key, and declare (in the database
description) that the key be unique.
this isn't really the best idea, though--you'll shut out
(potentially) tons of visitors that come from the same IP,
such as a proxy server (ahem, *AOL*, ahem) and allow the
same user to vote if he is coming from an ISP which uses
dhcp to assign addresses.
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