Yes, each forum needs to be signed into separately. However, you can use the same user credentials for any Bimmerpost forum, so you only need one account (and, in fact, just as a reminder, having multiple accounts is a violation of the site’s TOU).
Furthermore, if you check the “Remember Me” box, you will remain logged in to a forum indefinitely so you don’t have to enter your username and password every time you visit.
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