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I would like to know how to make an overlay application.

Level 2

We are making an application that can translate English speech in real time and display the text in Japanese.

It would be easier to understand if you imagine that we are making an application like oculus move or a notification function.

Is it possible to display sentences on the game screen without interrupting the operation when other apps are running?

If possible, I would like to know the website or other information on how to do that in programming.