OK, wow...

I have a meeting going on my MacBook Pro (just watching) and am working on my Mac Studio next to it.

I happened to drag my mouse over and it ended up on the laptop...and the keyboard works there too when the mouse is over there.

🖥️ + 💻

I knew I could do this with an iPad (sidecar) but I had no idea I could trivially use both my desktop and laptop at once 🤩

Universal Control: Use a single keyboard and mouse between Mac and iPad

Use the keyboard, mouse, or trackpad of your Mac to control up to two other nearby Mac or iPad devices, and work seamlessly between them.

Apple Support
@nolano that accidentally happened to me for my work and home laptops!