Creation of an application with a transparent ui (allowing to see the desktop)


I am trying to find out how to create a teaching assistant for my students and I would like it to be “a widget for windows” that is to say that the background of the application allows the desktop to pass. Here is a link of what interests me about Unity. ( Transparent Unity App! (Overlay, Assistant, Particles) - YouTube ).

Someone have an idea ?
Thank you for your feedback

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Hi ! did you succeed ?