[Sam Bauers]

I tend to use these terms and they are all potentially mutually exclusive, no one type of integration absolutely depends on the other although the first one generally requires the second one to work (99.9% of the time).

• Cookie integration – Sharing of login cookies with WordPress
• User database integration – Sharing of user data tables with WordPress
• Deep integration – Including the WordPress codebase (PHP) inside bbPress to allow use of WordPress functions inside bbPress