Keys for document and program windows

ALT+TAB
Switch to the next window
ALT+SHIFT+TAB
Switch to the previous window
CTRL+W or CTRL+F4
Close the active window
CTRL+F5
Restore the size of the active window after you've maximized it
F6
Move to a pane from another pane in the program window (clockwise direction)
SHIFT+F6
Move to a pane from another pane in the program window (counterclockwise direction)
CTRL+F6
When more than one window is open, switch to the next window
CTRL+SHIFT+F6
Switch to the previous window
CTRL+F7
When a document window is not maximized, performs the Move command (on the Control menu for the window). Use the arrow keys to move the window, and, when finished, press ESC.
CTRL+F8
When a document window is not maximized, performs the Size command (on the Control menu for the window). Use the arrow keys to resize the window, and, when finished, press ESC. 
CTRL+F9
Minimize a window to an icon (works only for some Microsoft Office XP programs)
CTRL+F10
Maximize or restore a selected window
PRINT SCREEN
Copy a picture of the screen to the Clipboard
ALT+PRINT SCREEN
Copy a picture of the selected window to the Clipboard