yes, and due to the architecture of the web. Knowing the actual computer ID is unreliable also. But you can still trace the IP to the origination IP. It all depends on how much effort you want to use.( there are tons of utilities that can trace this) But, using whois you can trace down the ISP and they usually use the same patterns for IP's. I was on a spam rampage and I can trace anyone back to thier orignal IP that the email was sent from. Even if its sent within IP hider types. And if this tells me thier ip location, so will the requesting machine. all you really need is the ISP server name and a few other bits which are inside the request header. Everything is traceable. There maybe hurdle, but tons of sites in the UK tell you how to get past anyone of them. IP or a mac address is your best bet. But, last time i looked at a header the mac address wasn't there. And due to security you wont be able to get it, unless you create an active x control to run on your page. Much like AJAX. Nick
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