How to identify unique user?

Question

Question

How can you determine if a user is unique or not?

I understand there are many ways to do this using cookies, but what about methods that don\'t us

Answer 1

As FrustratedWithFormsDesigner alludes to above, if you're not going to use cookies then you've got to use IP addresses. You can combine this with the user-agent, but even that is not infallible.