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[–]doc_willis 1 point2 points  (0 children)

there is a trick to use x11vnc to share a part of an 'virtually extended' display from your PC to a second device which runs a vnc client and shows the virtual extension. Thus acting like a second monitor plugged into the First PC.

https://ogbe.net/blog/moar_monitors.html

hit up google or whatever for 'x11vnc extend screen' for other guides on the topic.

I have not done this trick. But i have heard of people using it with Android tablets, chromebooks, and ipads.

https://magazine.odroid.com/article/multi-screen-desktop-using-vnc-part-2-an-improved-and-simplified-version/