The windows operating system have shutdown, logoff and restart functions in the start menu. If you have these options in the windows system tray, you can turnoff or logoff computer instantly. There is tool called iPower which sits in the system tray and gives you the options to shutdown, restart and logoff from there itself.
After launch of this tool the tool sits in the system tray, you need to choose your option from the list(Logoff, Reboot and Shutdown) before implementing the function. By default the tool runs in the shutdown mode, if you double click the tool in the system tray then the tool works according to the selected function.
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