1. I installed wordpress on /blog and mediawiki on /wiki and bbpress on /talk
-> for this I added an absolute path with the line $WP_relpath=’/var/www/html/krcla/blog’; and set the cookies to point to the root folder
2. some others that I can’t remember at this point..
The result is that MediaWiki ends up being somewhat heavier than a plain mediawiki, but by redirecting both bbPress and MediaWiki logins to WordPress, I get a single WordPRess login action -> logged in WordPress, bbPress, and two MediaWikis!