MotionlessSeagull22 the experiment will be logged according to the user who's credentials are configured in the trains.conf file used by Trains when running the experiment. The experiment will be stored with a reference to the User's ID, and when showing the experiment, the UI will get the user's name from the server.
If the user name in the system will be changed (like I suggeted in my previous message), the UI will simply be able to retrieve the update user name, but the experiment will always hold the user's ID (which will not change)