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It works by connecting an iPad to your Mac or MacBook and then loading up the app on that iPad to show a TouchBar interface, which you can interact with in a similar way to the actually TouchBar, it even seems to change as you move between apps.
It’s a pretty cool thing, however, it probably isn’t going to change your life, so don’t expect it to do much, think of it like a demo.
You can give it a quick look via the video below, and you can download it for yourself at the source link at the bottom of this article.
Source: GitHub (TouchBarDemoApp)