From Desktop
A: Windows Key + Tab = Aero [press Tab to cycle between Windows]
B: Windows Key + E = Windows Explorer is launched.
C: Windows Key + R = Run Command is launched.
D: Windows Key + F = Search (which is there in previous Windows versions too)
E: Windows Key + X = Mobility Center
F: Windows Key + L = Lock Computer (It is there from the earlier versions as well)
G: Windows Key + U = Ease of Access
H: Windows Key + P = Projector
I: Windows Key + T = Cycle Super Taskbar Items
J: Windows Key + S = OneNote Screen Clipping Tool [requires OneNote]
K: Windows Key + M = Minimize All Windows
L: Windows Key + D = Show/Hide Desktop
M: Windows Key + Up = Maximize Current Window
N: Windows Key + Down = Restore Down / Minimize Current Windows
O: Windows Key + Left = Tile Current Window to the Left
P: Windows Key + Right = Tile Current Windows to the Right [Continue pressing the Left and Right keys to rotate the window as well]
Q: Windows Key + # = Quicklaunch
R: Windows Key + = = Magnifier
From Windows Explorer
S: Alt + Up = Go up one level
T: Alt + Left/ Right = Back/ Forward
"Windows 7 Tips: Twenty Windows 7 Keyboard Shortcuts"
Reference : www.WindowsVJ.com
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