Users are the people who have been granted access to the account.
Each user must be give a unique login.
The email can be duplicated amongst multiple users if needed.
A master user can create and edit other users and view the user history for a user.
If a user is assigned a group, then they will only be able to view/edit the other items that have been assigned to that group and the items that have been assigned to "All Groups". The items are vehicles, zones, recipients, and all alerts.