Share X11 desktops with other users via X2Go

 X2Go is a server based computing environment with
   - session resuming
   - low bandwidth support
   - session brokerage support
   - client side mass storage mounting support
   - client-side printing support
   - audio support
   - authentication by smartcard and USB stick
 .
 X2Go Desktop Sharing is an X2Go add-on feature that allows a user to
 grant other X2Go users access to the current session (shadow session
 support). The user's current session may be an X2Go session itself or
 simply a local X11 session.
 .
 This package contains all the integration and configuration logics
 of a system-wide manageable desktop sharing setup.