iPad can be turned into a Touch Bar for any Apple computer.
Good news for owners of Apple computers without Touch Bar: in macOS Catalina, Apple added the ability to use the iPad as a touchpad.
The new Sidecar feature allows you to connect your iPad to your Mac either wiredly or wirelessly. The input device is supported by the Apple Pencil.
In macOS-applications with support for the touch panel, the controls are displayed at the bottom of the iPad screen, replacing the Touch Bar, which is in some models of MacBook Pro.
Sidecar feature is available on all MacBook, MacBook Air, MacBook Pro and iMac since 2015 release, as well as on Mac mini since 2014 and Mac Pro since 2013 release.
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