From Fedora Project Wiki

David has done a lot of work on this recently. See http://file.rdu.redhat.com/~davidz/xdg-hostname-draft3/index.html and http://people.freedesktop.org/~david/xdg-hostname.png. David proposes a dbus system service that manages the hostname and its variants.

Applications that need porting to this new interface include nautilus, gnome-user-share, vino, vinagre, avahi, NetworkManager and gdm.