US Patent 7760995 Window display system and window display method

When a choice is made between several items offered in a first window on a display screen, a second window is displayed in front of the first window. An image of an watcher who is watching the display screen is captured to detect watcher's eye position relative to the display screen. When the watcher's eye position moves, the second window is displaced to uncover the first window in such a way that the second window moves upward in response to a downward movement of the eye position, downward in response to an upward movement of the eye position, rightward in response to a leftward movement of the eye position or leftward in response to a rightward movement of the eye position.