The following Windows Hotkeys for Windows XP up to Windows 8 give you quick access to many functions:
Windows Key + F = Search for anything on your computer
Windows Key + Q = Search installed Apps (8 only)
Windows Key + W = Search settings (8 only)
Windows Key + , = temporarily peek at desktop (8 only)
Windows Key + D = Show desktop
Windows Key + M = Show desktop, minimise all windows.
Windows Key + Shift + M = Restore all minimised windows.
Windows Key + . OR Shift . = Snap Windows 8 App to right OR left (split screen multi-tasking)
Windows Key + ? OR ? = Snap desktop window to left or right.
Windows Key + ? OR ? = Maximise or minimise window
Windows Key + X = Windows 8 Advanced Windows Settings Menu (eg. shutdown).
Windows Key + Page Up/Page Down= Move Start Screen and apps to secondary monitor on left/right
Windows Key + Print Screen = Take screenshot, Edit > Paste in image editor (Windows 8 instantly saves in Pictures folder)
Alt + Print Screen = Capture focused window only, then Edit > Paste in an image editor like Paint.
Windows Key + Pause|Break = System Properties (eg. Windows version, Processor, RAM).
Windows Key + P = Choose secondary display modes.
Windows Key + U = Open Ease of Access Centre
Windows Key + Enter = Open Narrator
Windows Key + Plus (+) Key or Minus (-) Key = Zoom in or out using Magnifier
Windows Key + Esc (Escape) = Exit Magnifieru
Windows Key + Spacebar (or Shift + Spacebar) = Switch input language and keyboard layout.
Alt + F4 = This will either: Quit Windows 8 app, or exit program, or shutdown computer if all windows minimised.
Windows Key + E = Open Windows Explorer window.
Windows Key + L = Lock PC and go to lock screen.
Alt + ? OR ? = Navigate forward or go back in any Internet browser.
Ctrl + Mousewheel = Zoom view type in Explorer, Zoom view in any internet browser
Fast Windows shutdown: Windows Key + M then Alt + F4 then Enter.
More useful keyboard shortcuts for Windows and Mac platforms and many programs can be found at www.shortcutworld.com