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In a second step, i'ld like to try to use page to describe local contents instead of "Frontpage" element. I'd first test in some testing subfolder before to modifiy existing folders. But I think the layout of a page is much more simple than the layout of a wiki "Frontpage", specially when we are not logged in.

I've tested that on a few folders. For example :
http://puredata.info/community
When we are not logged in, the layout is much more clear.
But can every logged member still edit this page?