Xzibit is a way to share individual windows across the network. It's a Mutter plugin which adds a "share with contact" option to the window menu, and sends the window via RFB through Tubes to the contact. On the other end, if the user is also running Xzibit, the plugin takes care of displaying the received window.
Both users can interact with the window; mouse clicks and keypresses on the remote side are transmitted over the network.
The project is hosted by Collabora Ltd.
The protocol
(write description of protocol here)