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How to Understand the GUI API of macOS?

How could one go about probing the internals of macOS to learn about the API driving it's GUI? It would be useful while providing GUI handling capabilities using a language not supported by Apple.
( 3 comments | 3 points | on HN )
Re:How to Understand the GUI API of macOS? by high_byte on Friday November 26, 2021 @08:02AM (#29349887)
not macos user, but may I suggest alternatives such as HTML or Python Qt or maybe python fire+gooey?
Re:How to Understand the GUI API of macOS? by tony-allan on Thursday November 25, 2021 @09:10PM (#29346914)
Watch GUI events
Re:How to Understand the GUI API of macOS? by mayureshkathe on Thursday November 25, 2021 @09:13PM (#29346926)
Any reading material (physical/online) which might help me?