How To: Make a "Shutdown Timer" on your PC
Do you want you PC to shut down after a certain time has passed? Like 20 min?
Its very simple. You right click on your desktop and choose "New", than Shortcut. Type in "shutdown.exe -s -t". After the "t" you should type how many secounds the timer will be on, like 60 = 1 min. "shutdown.exe -s -t 60" will be a timer on 1 min before shutdown.
Once you have activated the shutdown, you cannnot stop it, so be careful, and enjoy :). Now you know how to.