Integrating web site and PunBB

I am interested in trying an integration of PunBB into a web site. Obviously this could be done in different ways, but I only wish to explore the idea at this point. The following method sounds like a good starting point.

In another thread someone had asked: "How can place my website's menu and logo above the punbb forum, so users can navigate through the website while viewing the forum?"

To which Slavok had answered:

"The easiest way is to edit the "<FORUM_ROOT>/include/template/main.tpl" file. Do you need more information?"

I would like more information please.