This began life with the intention of being able to audit changes if I implemented some kind of score entry option for hand-held devices.
But it has still proven interesting in score entry to verify who entered a particular score. Or to check to time to verify in which order "finger" violations were entered.
The button only appears on the screen if data has been entered for that stage. The data is modified when you hit OK on that stage (or arrow to the next or previous stage); it is not updated if you click Cancel.
The "updated by" defaults to the computer name.
If you are doing a match where different people are using the computer, you can manually override that and put in initials instead on the main score entry screen.