Keyboard shortcut for Windows to minimize all open windows and display the desktop

One way to to minimize all open windows and display the desktop is to click the 'Show Desktop' button:

Windows 7:
show_desktop_button_win_7

Windows XP:
show_desktop_button_win_xp

Another way to minimize all open windows and display the desktop is to Right click on the taskbar and choose ‘Show the Desktop’:
show_the_desktop_from_taskbar

You can also use keyboard shortcut ‘Windows Key + D’ to minimize all open windows and display the desktop directly.