I'm programming a "Question of the Day" or survey in an ASP page and I want to detect when someone who has already voted cannot do it again. I know many ISP's dinamically assign IP addresses, so ServerVariables("REMOTE_HOST") can't help. Cookies aren´t reliable. I've programmed Outlook objects from VBScript on the page to look at Contacts and email addresses, but this method is yet less reliable. Do you know a way to do this?