WINDOWS 8 AND WINDOWS 8.1 HIDDEN SHORTCUT KEYS

• Press the Windows key to enter the tiled Start screen.
• The Windows key + M minimizes everything that's showing on the desktop.
• The Windows key + E opens Explorer for quick access to folders.
• On the Start screen, press the Windows key + D to instantly get to the desktop.
• The Windows key + Tab opens a list of currently running programs.
• The Windows key + Print Screen takes a screenshot and saves it in a Screenshots folder nested in your Pictures folder. 
• To take a screenshot on a Windows 8 tablet, simultaneously press the Windows button and the volume-down button on the tablet chassis.
• The Windows key + Q opens a global search menu. Type what you're looking for and where you would like to look.
• The Windows key + W opens a search in your system settings to quickly locate and change system properties.
• The Windows key + F opens a file and folder search.
• The Windows key + Pause opens the system properties page to show you a quick rundown of your specs.
• The Windows key + ","  makes all current windows transparent, giving you a peek at the desktop as long as you hold down the Windows key.
• The Windows key + "." snaps a window to the right or left side 
• The Windows key + R prompts the Run command—useful for quickly launching apps and other routines with a command prompt.
• The Windows key + X opens the Quick Access Menu, exposing system functionality such as the Command Prompt, Disk Management, File Explorer, Run, and more. Alternatively, you can right-click on the bottom right corner of the screen to spawn the Quick Access Menu.
• The Windows key + I opens the settings menu, giving you quick access to the Control Panel, Personalization and your Power button, among other features.
• The Windows key + O locks orientation on devices with an accelerometer .