Private Posting Forum Between Staff and Users

[bmc]

I have seen this mod used before at TAZ on one of the forums to where users can create new topics and their topics that they submit are private and only viewable to them (them being the users who submitted the topics) and the staff members (or set groups that can view the topics in that forum, e.g. Administrators and Staff), and no other users can see what other members submit. It kind of acts like a ticket system. I don't know what this mod is called, but if someone could help me out and point me in the right direction, this would be awesome!

Thanks in advance!