How to use your iPad as a second monitor for your Windows computer

To use an iPad as a second screen on a Windows 10 computer, you'll need to use a third-party app like SplashTop.
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Yes, You Can Use Your iPad As a Second Monitor Without Sidecar

Sometimes you just need a quick and easy way to connect a second monitor, without dealing with a whole new display. Apple's Sidecar feature lets you turn your iPad into a second display for the Mac, ...
Wired

How to Use Your iPad as a Second Monitor With Your Mac

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How to use your iPad as a second display for your Mac computer without any wires or add-ons

You can use your iPad as a second display for your Mac through the Sidecar feature, which comes pre-installed.