The Work/Stop mode appears for employees with attendance status Clocked-in and the setting Work only in the Update Employee procedure, and is often used for so-called machine recording.
You can open procedures from this mode, to start and finish work in the same was as in the Work/Out mode, but the buttons for clocking-out have been exchanged for the Stop button. In all other respects, the window has the same contents as the Work/Out mode.
Please see the help chapter for Work Recording for more information regarding machine recording.