How to share a single session between more than one user at the same time on Ubuntu 12.04

Question

Is it possible to share the same session for more than one user at the same time?! if yes how to do that?

Answer 1

Edit the sesman.ini and unders the section [Sessions] add the following :

AllowSharing=1

Answer 2

Tmux and GNU Screen are well-known utilities which allow multiplexing of virtual consoles. Using either, it is possible to start a session, detach, move to a different machine and resume the session in uninterrupted progress. It's also possible to use these tools to share a single session between more than one user at the same time.
This is a nice tutorial to learn about