PHP Include a forum?

I have a phpBB forum, and I was wondering if I could put it in my site like this: http://forums.short-designs.com/ instead of just a whole phpBB page. Could this be done with php includes? Like:

<?php
include ('www.mydomain.com/forum')
?>

And then it would work? Or not..?

No, it would cause problems with user sessions, cookies, etc. The only way to do this is through templating. You can easily add your own custom header to phpBB.

I suggest using a smaller board if you intend on intergrating it in such a way.. PHPBB tends to be quite a hassel for any type of intergration.