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AMZN 237.26+1.8%10:30 AM EST

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To: Eric Wells who wrote (74998)8/21/1999 3:11:00 PM
From: Martin Muldoon   of 164684
 
Eric,

I just looked on the Media Metrix site for how they measure unique users. They don't explain how they do it. I doubt it's by counting the number of unique ip addresses though. I know that many ISP's use different types of technology to conserve ip addresses because there is a limit to the number you will be granted. At the company that I work for we use a feature of NT server called DHCP. You are assigned an address when you log on the network but it becomes available again the moment that you log off. I don't know what AOL does but I know MSN uses this.

This being the case, the only way that I know of other than a person logging on is through the uses of Cookies which is what they do here on SI if you check the Keep me logged in? box on the log on page.

Hope this helps.

Martin
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