My site has three parts: a main site, a blog that uses WP, and a forum that uses bbpress. I need to replace the CMS on the main site, and since I already use WP for the other two parts, I figure to minimize bugs I should use WP as the CMS on the main site. However, all the tutorials I've seen for installing WP as a CMS do not involve integrating it with a blog or bbpress.
Do I have to download and install WP again as a CMS? How do I make all three parts work together? Also stickifying the situation is that there are shared components across the three parts (a common login and theme, etc.).
Any guidance would be appreciated.