Xdmx is an X11 tool that lets you treat two or more* X11 servers as two or more monitors. I tried to use it to make an old laptop be an external monitor (connecting over Ethernet). The old laptop would run an X server, and Xdmx would connect to that X server and to the one on my regular laptop. Then X11 applications would connect to Xdmx (which itself provides an X-server API), and I could move them between screens at will. Theoretically.
( Read more... )