Selector Tracker Fields User, Group, IP and Page selectors are tracker field type s used in the trackers feature to link items to other objects or users. Sometimes these fields are automatically detected, such as a user selector detects the username of ther person creating the tracker item. Adding a name to a tracker item is necessary but not sufficient to create special viewing and editing privileges - often used with User Tracker , registration tracker or Group tracker The page Adding fields to a Tracker explains how the fields, (columns or questions) of a tracker are set up.