Just curious, this could be a trade secret, but... since vBulletin isn't open source and I can't dissect the code myself, I was just wondering if anybody could fill me in on what it's doing here; When you view a thread, the URI tells me I'm viewing an HTML page, with the naming convention ####-thread-title-without-common-words.html. Now does vB actually write a new physical file for each thread, or is it parsing the thread number out of the URI and processing the request based on that?

I realize the purpose is to be search engine friendly, and the curiousity was about what way they decided would be most efficient to accomplish that. Right now, personally, I'm abusing the hell out of mod-rewrite.
-m