Techniques for passing data around

I have used $this->Session->write and $this->Session->read to pass
data around my Cake app. The problem with this method is that the
user could have two or more browser windows on the go and a session
variable could get overwritten. I was wondering if there is a way of
preventing this, like using some sort of browser ID to prefix the
variables name?

I have also used parameters in the URL to pass data. I was also
wondering whether there are any other techniques and which is the best
technique.

Thanks.

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