https://techcrunch.com/2021/06/07/macos-12-monterey-upgrades-continuity-with-universal-control/

During the WWDC conference today, Apple unveiled the new macOS 12 Monterey. A major feature in the macOS update is Universal Control, which builds upon the Continuity features first introduced in OS X Yosemite. For years, it’s been possible to open a news article on your iPhone and keep reading it on your MacBook, or to copy and paste a link from your iPad to your iMac. But Universal Control takes these features further.

With Universal Control, you can use a single mouse and keyboard to navigate across multiple Apple devices at once. This functionality works across more than two devices – in the demo video, the feature is used to seamlessly move across an iPad, MacBook, and iMac. Users can drag and drop files across multiple devices at once, making it possible, for example, to use a multi-screen setup while editing video on Final Cut Pro.