Tunnel X Windows Securely over SSH

SSH is frequently used to tunnel insecure traffic over the Internet in a secure way. Simply type the following command:

$ ssh -X user@remote.node

You can requests compression of all data to improve up user experience (good for a low speed link such as wan link) using -c option:
$ ssh -c -X user@remote.node

Once logged in type any X windows program name such as:
$ xeys &
$ oowriter &

To start kde type:
$ startkde &

To start default desktop type:
$ startx