History: In Group Field

            ! In Group Tracker field

This field allows to display if the user of the item belongs to a group (will display Yes or No) or to display since when he is in the group

The parameter contains
* the name of the group
* eventually the string 'date'

Example:
Teachers
Teachers,date

To work the tracker must have a field of type user selector with option 1 (creator).

For instance, you can use that field in a tracker, and then request with a ((PluginTrackerList)) to list all records from a user tracker which belong to a specific group, and show all their details: phone, address, etc.  

See also: ((User Groups)) tracker field, which is more powerful.