In Windows you can create shortcut that will shutdown, hibernate or restart your system. This shortcut can be placed on desktop, quick launch toolbar or any other place for shortcuts.
Here is how you create it.
Creating
1. Right click on empty space on your Desktop
2. Click “New”->”Shortcut”
3. In “Type the location of the item” box type:

For shutdown: shutdown.exe -s -t 0
For restart: shutdown.exe -r -t 0
For logoff: shutdown.exe -l -t 0
For hibernation: rundll32.exe PowrProf.dll, SetSuspendState Hibernate
Parameter -t 0 will execute shutdown immediately. If you change -t 0 parameter to -t 60, shutdown will occur in 60 seconds and so on.
More information about shutdown.exe parameters is available at Microsoft
4. Click “Next”
5. Enter a name for the shortcut and click “Finish”