Here I will show you how to interact with applications remotely. This is quite useful when you have for example an Ubuntu Server that doesn't have a graphical environment (Gnome or KDE) and a Desktop that has and you need to use some graphical applications on the Ubuntu Server but you can't because you don't have a graphical environment.
So whit this you can show and interact with the graphical applications on the Ubuntu Server, using your Desktop's, graphical environment. So in the X11 world you have the following:
Ubuntu Server - X11 Client --> Application is executed
Ubuntu Desktop - X11 Server --> Application is shown
It's a bit confusing at first, that your Ubuntu Server is your X11 Client, and you Desktop is the X11 Server.
Note: this was tested on Ubuntu 8.04 and 9.04.
X11 Server - Where the remote apps will be shown
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my_user@my_desktop:~$ ssh -X root@remote_server
root@remote_server:~$
Now you have a what looks like a normal ssh remote terminal on the "remote_server". But when you execute an graphical apps on the remote server it will be displayed on your desktop, for example:
root@remote_server:~$ gedit
With this you can make a text file on your machine tha will be saved on the remote server.
If you want ssh to always act like this, have the following line in your /etc/ssh/ssh_config:
ForwardX11 yes
With this method all the data over the network will be encrypted, because of ssh, but if you want to kick it old school, whit no encryption an a lot more complicated using X11 directly, you can check the post "Run Applications Remotely via X11 - Hard Way"
Based on: http://wiki.linuxquestions.org/wiki/X11_forwarding_with_OpenSSH
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