I think your talking about security levels with the wiki?
An example is that everything on tikiwiki.org is public access, if you want to amend something you just need to register. and you have edit permissions. However a site like http://tikigod.org has closed permissions, meaning you can only view what I put there.
Hope that helps a little and see you in IRC sometime!!
(Im in GMT, how many hours is that? Time to go look it up )