User Groups are heart of your site's security. When you choose access or ownership privilidges for certain parts of your site, such as specific Articles, you choose from the list of Groups. Each group has a Level, a number between 1 and 99. Members of a group can see everything secured to their Group and every secured to lower level groups. Members of a group can not see content secured to other groups of the same level or content secured to groups of higher levels.
There are a few built-in groups that cannot be deleted.
Members (Level 1) - Users who register for an account through the form on your site become a member of this group
Members (Level 2) - This group exists as an example
Members (Level 3) - This group exists as an example
sub-Administrators (Level 98) - This group (and other groups at this level) can log in to administration, but cannot manage content has an Ownership set to other 98 and 99 level groups.
Administrators (Level 99) - This group can log in to online administration and can access everything on the site.
Members of groups of a particular level, such level 10, can not see content assigned to other groups of the same level. Two groups of the same level are, in a sense, parallel.
You cannot add other groups with a Level of 99, but you can add other groups with a Level of 98 or below.
To manage your site's groups:
Click User Groups under User Accounts in the administration menu.
The following page will display the list of User Groups. In the far right column, there is a number that shows how many Users are in that group. Click the number to display those Users. While those Users are displayed, click List All Existing Users to return to the complete list of users.
