The symbol on the login screen allows the employee to Clock In/Clock Out. Using this feature, you can now easily keep track of the working hours of all employees. The working hours along with the hourly pay rate provide you with a detailed payroll report which saves you from the hassle of making calculations manually.
You can have the clock in/clock out forced for any employee to make sure that none of the shifts are missed in the record. Forcing the clock in will ensure that the employee is not able to log in until they are clocked into the system.