Question Posting only in Child Forums

I am curious if it is possible to only allow posts in the child forums and if so, how to do it. I have read the documents and searched the forum but I can't seem to find an answer. I have a private site and the forums are open to everyone, although they must register to even enter the site.

Thanks a bunch, 1.6 is beautiful and the upgrade was seamless....you all rock!

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