How to identify which program has left a portion of its UI floating on my screen?

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Music by Eric Matyas
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Track title: Puzzle Meditation

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Chapters
00:00 Question
01:40 Accepted answer (Score 32)
04:00 Answer 2 (Score 26)
05:50 Answer 3 (Score 4)
06:10 Answer 4 (Score 1)
06:42 Thank you

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Full question
https://superuser.com/questions/1544706/...

Question links:
[image]: https://i.stack.imgur.com/K3CR0.png
[the answer below]: https://superuser.com/a/1545136/268750
[image]: https://i.stack.imgur.com/v0LnG.png

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https://meta.stackexchange.com/help/lice...

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Tags
#windows #googlechrome #process #gui

#avk47