Keyboard shortcuts key are very important to increase our productivity and to save our valuable time. Remembering these shortcuts will help you to increase your productivity.Here is a list of keyboard shortcut keys of Windows 7 lists-
Lock screen :- Windows key + L
Minimize all open windows :- Win + M
Minimize all but the current window :- Win + Home
Undo all window minimization :- Win + Shift + M
Maximize window :- Windows key + up-arrow
Make all windows transparent to see the desktop :- Windows key + spacebar
Cycle through all open windows :- Alt+Esc
Switch between open windows :- Alt + Tab
If the current window is restored, minimize it; if it is restored, minimize it :- Win+Down Arrow
Open Run dialog :- Windows key + R
Open Search box :- Windows key + F
Dock window to left or right half of screen :- Windows key + left- or right-arrow
Go up a level in Windows Explorer :- Alt + up-arrow
Close the active window :- Alt+F4
Switch to previous active window :- Alt+Tab
Cycle through applications on taskbar :- Win+T
Launch apps pinned to the Taskbar[1 is the left most app] :- Win + (number 1-9)
Open Windows Explorer to computer :- Windows key + E
Rotate a picture clockwise or counterclockwise :- Control + period or control + comma
Turn Sticky Keys on and off :- Press Shift key for five times
Toggle showing the desktop :- Win+D
switch monitors :- Wind + P
Flip 3D :- Win+Tab
Persistent Flip 3D :- Ctrl+Win+Tab
