Some Useful Windows Shortcut KeysUsing the Windows Key in combination with other Keys:WIN+R to launch RUN dialog box
WIN+E to launch Windows Explorer
WIN+L to lock
WIN+P to launch Mobility Center or External Display selection screen
WIN+X to show WIN+X menu (Windows 8 and later)
WIN+C to show Charms Bar (Windows 8 and later)
WIN+PrntScr to capture computer screen and save screenshot (Windows 8 and later)
WIN+S or WIN+F to launch Search
WIN+D to show the Desktop
WIN+M to minimize all running programs windows
WIN+SHIFT+M to restore all running programs windows
WIN+Break to show System Properties
WIN+B to set focus on system tray (Taskbar notification area) icons
WIN+T to set focus on Taskbar buttons
WIN+number key (0-9) to switch between Quick Launch toolbar or Taskbar buttons
Disabling Some or All of these hotkeys can also be done.
AskVG has a tutorial on that topic.