What does MAX_FILE_SIZE do?

I was reading about this here: http://us3.php.net/manual/en/features.file-upload.php It says: <quote> But you should add MAX_FILE_SIZE anyway as it saves users the trouble to wait for a big file being transferred only to find out that it was too big afterwards. </quote> So, I decided to add <input type="hidden" name="MAX_FILE_SIZE" value="30000" /> to my form. It didn't seem to do anything. Is the browser supposed to use this to throw a browser-genrated error to me, or something? -- Regards, Ben Ramsey http://benramsey.com http://www.phpcommunity.org/wiki/People/BenRamsey