I have a Microsoft Surface RT tablet that I want to use as a second monitor for my Ubuntu laptop using Splashtop Remote Desktop as in this video : https://www.youtube.com/watch?v=ldb0RvmXzsA
So far, I can get the tablet to mirror the display on my laptop, but not to extend it.
I think it could work in theory, if only I could trick the laptop into creating a second "virtual" desktop, even though I don't have a second monitor hooked up. There seems to be a feature for this in Windows, but is there a way to do it in Ubuntu?