X.org already has this feature built in: XDMX.
No need for Dummy Plugs. Can do 200 screens if you want.
You can create extend your desktop to virtual screens all you like.
No need for Dummy Plugs. Can do 200 screens if you want.
You can create extend your desktop to virtual screens all you like.
But on mac and windows this is a quite different situation.
XDMX won't work with Mac OS, thought, except you want to work with X11-only apps (defacto a lightweight "virtual machine" without native mac apps).
The Xdmx changelog stops 16 years ago: http://dmx.sourceforge.net/ChangeLog , the last update at https://sourceforge.net/projects/dmx/ is 5 yrs ago. It still uses CVS at Sourceforge. The code will certainly still run modern day X11 applications, but probably with poor performance.
I wonder what Wayland can offer in this respect (regarding fancy X11 servers such as Xnest, Xvnc or Xdmx).