Windows 7 is smart about windows. Dragging a window to the top of the computer screen maximizes it automatically. Dragging a window to the left or right side of the screen resizes it for side-by-side comparisons to other windows. And moving the mouse to the lower-right corner of the screen makes all open windows transparent. If you shake a window all other windows will minimize, shake the window again and all minimized windows will be visible again.