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I think you can get the GUID without the web page going insecure in the browser. Think that's what poll/voting-pages normally use.



That's windows only isn't it? I would have thought that cookies would be more portable.

Les, are you going to have problems with the user using another computer or terminal server / citrix logins? I can't imagine your users are going to remember their "usual" MAC address if they are not at their usual computer.