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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.
Android Authority

I turned my old Android tablet into a portable monitor, and you can too

I own a torridly underpowered Android tablet from the good old days of 2019. Despite its waning age and paltry processing speed, I still tote it daily as a reading slate. However, I recently gave it ...