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These groups represent everyone on Gerrit. Anonymous users is used for a user account when they are not yet signed in to the site. Registered users are used for any account which is signed in. Like the admin group, these groups are blessed by being marked in the system config table as the special groups. Since their membership is managed automatically by Gerrit we do not permit a group owner to edit the membership list in the web UI. We also don't show the membership, as the membership isn't stored in the database, its computed on the fly under the assumption that everyone is in either group if they have an Account.Id assigned. Signed-off-by: Shawn O. Pearce <sop@google.com>