How can I authenticate users without forcing them to register?
<p>I want to make a website that I thought up, but I don't want to have the users register. Instead, I want some sort of unique id that can be retrieved using PHP. This unique ID could be to be with the network they are using, or their computer. </p>

<p>One idea I was thinking of was getting the users HWID and using that. Would that be possible?</p>

<p>Can someone give me the advantages and disadvantages of doing this, and also give me some examples of what I could use?</p>
