system
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btw there is another little thing that happens with feeds (it is not so far as I can see occuring from this forum). If it was I would have emailed Alwil privately to let them know 
If an SMF forum has a board setup that is not viewable to guests and most members. Let’s say it is only available to a few “groups” But invisible to all others. You will see the messages in that feed even IF the feed is setup so that it is to only show certain boards. This is suppossed to work by permissions and cookies but it does NOT work well at all. You can tell the feed to pull specific boards but you can NOT tell it to deny specific boards.
i.e. the boards you think the public can not see - they can