TWiki Groups »  All Authenticated Users Group 
This is a special group all authenticated users belong. The main use of this group is to lift a web level restriction at the topic level.
This is close to 
AllUsersGroup. The difference is that unauthenticated users belong to 
AllUsersGroup but not to 
AllAuthUsersGroup. 
Let's say a web is viewable only by the members of the DarkSideGroup by the following line on WebPreferences.
   * Set ALLOWWEBVIEW = Main.DarkSideGroup
By putting the following line on a topic, you can make it viewable by anybody authenticated.
   * Set ALLOWTOPICVIEW = Main.AllAuthUsersGroup
This topic is not necessary for the group to work because the group is implemented in the code instead of a topic that has members.
Related topics: TWikiGroups, 
AllUsersGroup, 
TWikiAccessControl