If a time clock is used for access control, the punches made at the clock do not go to the employee's time cards but instead go into the Access table.
Access By Employee
Shows the accesses grouped by employee that occurred within the date and time selections made.
Access By Time
Shows the accesses in date/time order that occurred within the date and time selections made. If you want to know who used a particular access clock between certain hours, then this will show you the activity in the order that it occurred.