Use an iPad as a monitor for a Windows PC with Duet Display, the fastest way to add another monitor to your desktop or laptop.
How to Use a Tablet or iPad as a Second Monitor
Have an iPad? That Means You Have a Second Screen, by Gracia Kleijnen, The Startup
Turn your iPad into a second monitor for $9.99 - CNET
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Use an iPad as a second screen for a laptop using HDMI – no app required!
iPad as Second Monitor - Duet Display & SpaceDesk - Blendlogic
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How to Use an iPad As a Second Monitor for a Windows PC
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Turning an iPad into a Second Monitor for Pc & Mac: Duet Display
How to Use iPad As Second Screen? – AirDroid