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I'm intrugued as well, but that code looks like somewhat giberish to me. I know basic HTML.
-oddguy 
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It's php. php works like this:
You have your html page.
Inside it are php variables.
The variables are toggled by you.
Toggling the variables sets up the page ready to send data.
Clicking on "Go" sends this data to a server.
The server sends it through PHP to be "parsed" and "processed".
After processing the data, a new html page is generated with the variables you requested.
This happens when you post a new thread, post a new post, change your user cp options, do a search, or even send a pm.
Sending a pm is interesting though, because in most forums, it sends both your inbox, and the recipiants inbox for processing. It takes the message you made in your inbox, and moves that to the recipiants inbox, as though the content was there all along. It doesn't work quite like an email, where the whole message is sent down a pipeline. It's rather more like posting in one thread, but having the post appear in another. Weird huh?
