gnome@rivendell:/home/nazgul$ DISPLAY=:0 Xephyr -ac -screen 1280x768 :1 2> /dev/null &
[1] 23967
gnome@rivendell:/home/nazgul$ DISPLAY=:1 gnome-jhbuild-session
Gtk-Message: Failed to load module "canberra-gtk-module"
gnome-session[8303]: WARNING: Could not make bus activated clients aware of DISPLAY=:1.0 environment variable: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
gnome-session[8303]: WARNING: Could not make bus activated clients aware of GNOME_DESKTOP_SESSION_ID=this-is-deprecated environment variable: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
Gtk-Message: Failed to load module "canberra-gtk-module"
gnome-session[8303]: WARNING: Could not make bus activated clients aware of SESSION_MANAGER=local/rivendell:@/tmp/.ICE-unix/8303,unix/rivendell:/tmp/.ICE-unix/8303 environment variable: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.