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The real URL of the forum is:

/f-real-title-of-the-forum-1222.html

but if I type in:

/f-any-other-name-here-1222.html

Both URLs calling the Forum with the ID 1222.

This can cause lot's of duplicate content and will make Google really upset with your domain if you are unlucky.

My suggestion is to redirect

/f-any-other-name-here-1222.html

to

/f-real-title-of-the-forum-1222.html

Using 301 moved permanently headers.

The same problem with threads.

Example: When I rename a thread. If someone calling the old Threadname it should redirect to the new one, too.

Sorry for my bad english...hope it is understandable, what I mean.

Thanks.