Re: Grouping
You can have as many groups as you want in tikiwiki. Admin -> Groups allows you to create groups, assign users to groups, and assign permissions to groups (global permissions).
You can also categorize a page and assign group permissions on all of the objects (wiki pages, galleries, ...) in the category. You enable categories in Admin -> Features and then for each page, you can assign to a category (or categories). See CategoryPermissions and Categories and Permissions
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