Interesting idea if ab tablet could be used as an extra monitor without lag issues. Don't think a remote desktop -type SW would work too well.
The only similar thing I've tried is Roccat software to give games like ED more buttons, so it is technically an additional input, but nothing life a drawing tablet screen.
I have the 6th gen iPad 32gb with 1st gen pencil. Never really bothered using it. I will try it one day.lol (bought it 2018 fall) I want to try procreate.
I also have the DuetDisplay app for $11USD .. laggy and hard to use as a second display because of the pixel density and resolution differs too much from a normal 15.6 inch 1080p laptop monitor Check my sig.
The iPad is a quality screen but glancing back and forth between hurts my eyes. I only use it when I definitely need two monitors while mobile. I try to not use it. Yes i try not to.
I had to bring in a second monitor to use dual display with when I lived in Dorm. I had my 23 inch acer monitor and 15.6 laptop monitor and that faired well.
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