The function of this combination key is to maximize

Eight shortcut keys to improve efficiency of Windows 7(1)

For Windows systems, in addition to those common shortcut keys, the different versions of Windows will have some unique shortcut key combinations. To Windows 7, for example, if you can skillfully use the following shortcut key combinations, it can help you to improve you work efficiency in some extent.
1. Alt + P
In Windows Explorer, press Alt + P can quickly turn on / off the preview pane, and you can quickly view the selected file throug the preview pane. If you want to use mouse to operate, then you need to turn on the Explorer, click the "organization " -- "layout ", and then select or cancel "Preview Pane" option.
2. Winkey + Shift + up / down (arrow keys)
Use this key combination is to maximize or restore the current window , where the winkey is the spacebar key with Windows logo in the left and right keyboard. which is usually located between the Ctrl and Alt. Equivalent to mouse over the window frame and then hold up the drag to the top.
3. Winkey + Up / Down
The function of this combination key is to maximize the window by press the Winkey +Up, and press Winkey + Down to restore to the original state of the  window. If you press Winkey + Down directly in the state of the window is to minimize the current window.
4. Winkey + left / right
The combination key used to make the current window occupying half of the  left or right screen (depending on left and right keys to determine). And  in the case of multiple monitors, it will allowed the window to another monitor with continuous press the same direction key.