use wordpress code on a non wordpress page

I am trying to share / display a part of wordpress, (the page list) with a page that is not part of wordpress.

Basically, I am wanting to use the navigation I have in wordpress in a non wordpress page (phpbb3) so that it is used site wide.

WordPress is installed in the root of my website and in a sub folder I have a phpbb3 forum that I want to display the page list from wordpress on.

Thanks for any help.