Yeah, when these Java consultants did that in a search they built for the company I work for, I was amazed. I called them on their mistake and they first claimed it wasn't a problem and then claimed that it was our fault for not specifying in the contract that they had to support multiple browser windows! (The old "spec was bad" defense.)
I think the problem in their case came from how much the Java servlet session interface looks like a cache. It's very tempting to just cache things in it rather than build your own proper cache. This is something to be wary of with Apache::Session too.
(Incidentally, some of the other posters did mention the idea of using the search terms instead of the session. They just weren't as clear about why.)
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