Session Compositor

• nested under the system compositor. nesting is feasible because protocol is async, roundtrip would break nesting
• gnome-shell
• moblin
• compiz?
• kde compositor?
• text mode using vte
• rdp session
• fullscreen X session under wayland
• can run without system compositor, on the hw where it makes sense
• root window less X server, bridging X windows into a wayland session compositor