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Suggestions
Copy the file /etc/passwd to your home directory
Edit it and save changes
Change ownership of the file to the superuser ('root')
Try to edit it again
Switch user to become the superuser
View the last 10 lines of the file /etc/passwd
Switch back to your normal user
Notes:
The above xould do with reworking to be more relevant and work better with Knoppix!
Demo remote graphical apps. E.g. VNC to another Knoppix distro (get someone to start the server, by typing 'vncserver' at a command prompt), then ssh -X to a remote server and launch an app such as xeyes