[_ck_]

If you read the levels of integration I posted in the beginning here you will see that even the most simple level of integration requires cookie sync. It is impossible to sync the cookies between bbPress 0.9 and WordPress 2.6 because they literally use different cookies. A user cannot stay logged in between both. They will have to login twice. Log out twice. The db may be similar and the user table may be used by both but the login cookies are different.

I don’t know how to state it more clearly than that.