The problem with using IPs or cookies to assure only one vote is that you're not assuring only one person vote, by one machine vote. When a machine is in a shared environment (school labs, libraries, one machine for a family), that machine will only get one vote. If that's fits your audience then that's okay. I've often wondered if then I should replace any vote with a new vote. In other words, make the most recent vote the one that is kept, rather than the first vote.
Otherwise, you could have them enter an email address, which is closer to unique though still shared at times. Or log in using a unique id. -- Daniel Kessler University of Maryland College Park School of Public Health 3302E HHP Building College Park, MD 20742-2611 Phone: 301-405-2545 http://sph.umd.edu ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Adobe® ColdFusion® 8 software 8 is the most important and dramatic release to date Get the Free Trial http://ad.doubleclick.net/clk;160198600;22374440;w Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:300067 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
