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Yes, you can turn your old iPad into a dedicated PC monitor

This free and open-source app lets you use any device as an extended PC monitor for macOS, Windows, or Linux. Here's how to get started.
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You Can Use An Android As A Second Screen For Mac - Here's How

A second monitor for your PC or laptop can significantly enhance your productivity and reduce clutter. For Mac users, it's pretty easy to use their iPad as a secondary screen with Apple's SideCar ...