The Daily Email Reminders Tool is designed to assist with user compliance.
When executed, it finds all users in the system who are required to track time (bascially, that is anyone with a "Time" tab in their navigation). If that user has not yet entered time in the current day, they will be sent an email reminding them to log into Timesheet and do so.
The contents of that email, both subject and body, are configurable on the page containing the help link that brought you here (Custom Tools - Daily Email Reminder). You may use the special <FullName> value if you would like the user's name inserted in either place.
This tool is most useful when scheduled to operate automatically. The interface for doing so is identical to the scheduling interface for the import tools. We recommend for most companies that the tool be scheduled to operate daily, weekdays only, about an hour before the end of the business day.