Duplicate window display on 2 screens with X.org
As an engineering school teacher and technical lecturer, I’m often asked to give demonstrations, in addition to the classic slide show. Like any organized lecturer, I can’t do without my notes, elapsed time, etc., which are given to me by presenter screen software. This kind of software requires an extended display, i.e. the computer screen and the video projector display 2 different things.
The disadvantage of demonstrations is that the application window you want to show cannot be displayed on both screens at the same time.
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