Generate Attendance, found under the Clock menu, considers a Student's Schedule and populates the start and end time for the date(s) selected as the clock in and out time, respectively. Even if the student was not present, Jackrabbit looks at the Student's Schedule to determine the check in and out time. You can do this for all students or for a specific class.
If you use Generate Attendance AND students check in and out daily using the Clock, your families will be double-charged. Using both will create duplicate time entries for the days they attended that are also within their schedule.
To prevent using this feature, you can remove the user permission from any User IDs in your database.