Hi Kavita
I had the Unique Login plug-in my mind. I though the new log in will log out the old log in. Which is not what I want. I want Moodle to refuse the new log in.
In the mean time I've found https://docs.moodle.org/34/en/No_authentication. It achieves what I want if I adjust my concept. With "No authentication" the user chooses a Username - not the user01, user02, ... as planned, and there are no passwords! So there is a slight chance of two people getting the same Username(?) I will check.
General help
How to grab a neutral user account?
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