Shutdown trick

1. Right Click on your desktop → New → Shortcut.
2. Type shutdown -s -t xx -c "".  Give any number in the place of xx to specify the time limit in seconds(say 60 for a minute)
3. Click Next.
4. Click Finish. 
5. Clicking on that shortcut shut downs the computer after the specified time by displaying a warning message

 Now you can use it for these purposes:

• Rename it as "My Computer" or "Mozilla Firefox" and change its icon to the corresponding icon. Place it in the desktop and the illegal users may be cheated in case they click this shortcut.Heheh :) lol...
• Without specifying any time, use it as one click shutdown button for yourself. You can even access this button any time by assigning an hot key.