- The Unregistered Visitor (user_id 0). Visitors to an OpenACS site who have not logged in are assigned user_id 0. In a typical installation open to the public, the Unregistered Visitor can read but not create content. It is possible to change the standard permissions to allow the Unregistered Visitor to, say, post to forums. In this case the Unregistered Visitor acts much like Slashdot's Anonymous Coward.
- Registered Users consists of the set of all registered users.
- The Public is a composite group created by combining the Registered Users group with the Unregistered Visitor.
- When an acs-subsite is mounted "ordinary members" and "administrators" relational segments are created as subsets of the subsite's membership group (Registered Users for the main subsite mounted at "/").
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