How Universal Control on macOS Monterey works

The best moment of this year’s WWDC keynote was a straightforward demo of a macOS feature, Universal Control. The idea is simple enough: it allows you to use the keyboard and trackpad on a Mac to directly control an iPad, and even makes it simple to drag and drop content between those devices.

What made the demo so impressive is how easy and seamless it all seemed. In a classic Apple move, there was no setup required at all. The segment happened so fast that it even seemed (incorrectly, as it turns out) like the Mac was able to physically locate the iPad in space so it knew where to put the mouse pointer.

After Zaprudering the clip and asking Apple a few questions, I now have a better understanding of what’s going on here. It turns out...

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