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)

SuccessfulKoala55 one more thing I have logged experiment A by logging as User A and now if Logout and then Log in as User B and then log another experiment B, in the UI will it be displayed as user A or user B?

This is currently not supported. We can add this feature - let's say that by changing the user name in the configuration file, the server will update it on startup (so you'll have to change the configuration, than restart the server) - will that be a good solution?

SuccessfulKoala55 using username and password

Hi MotionlessSeagull22 ,
Are you using the Trains Server in the default setting (i.e. log in using just a user name), or with username/password settings?