Under Windows, to run a program on one host and display and interact with it on another requires a special "remote desktop" client and special hooks into the graphics driver and kernel.
Under Plan 9, the tool you use to redirect output from one machine to another is just "mount": mount /dev/mouse and /dev/draw from the other machine onto this one, run the command you want, and they appear on the remote machine - no changes required to the kernel or graphics drivers or any other part of the system.
Of course, remote display is just one application - since Plan 9 exposes just about everything as a filesystem, you can mount a remote machine's TCP stack or editor session or authentication keys or even actual ordinary file storage, transparently and easily.
Under Plan 9, the tool you use to redirect output from one machine to another is just "mount": mount /dev/mouse and /dev/draw from the other machine onto this one, run the command you want, and they appear on the remote machine - no changes required to the kernel or graphics drivers or any other part of the system.
Of course, remote display is just one application - since Plan 9 exposes just about everything as a filesystem, you can mount a remote machine's TCP stack or editor session or authentication keys or even actual ordinary file storage, transparently and easily.