Abstract: Systems and methods are provides for creating a window stack for a multi-screen device. The stack is an arrangement of an active window and at least one other active or inactive window for at least one of the two displays. The system can receive activation of a window in the device. Upon activation of the window, the system can determine a display associated with the active window and can determine a position in the window stack for the active window. Then, the system can generate a logic data structure for the active window to describe the position of the active window in the window stack.

Abstract: Embodiments are described for handling the launching of applications in a multi-screen device. In embodiments, a first touch sensitive display of a first screen receives input to launch an application. In response, the application is launched and a window of the first application is displayed on the first display. A second touch sensitive display of a second screen receives input to launch a second application. In response, the second application is launched and a second window of the second application is displayed on the second display. In embodiments, when an application is launched, it displays the view of the application (whether on the first touch sensitive display or the second touch sensitive display) that was displayed when the application was last closed.

Abstract: Systems and methods are provides for changing a user interface for a multi-screen device. The user interface can change based on the movement of a window. The system can receive a user interface event that modifies the display of windows in the user interface. Upon receiving the user interface event, the system determines if a window has been covered or uncovered. If a window has been covered, the window is placed in a sleep state. If a window is uncovered, the window is activated from a sleep state. A sleep state is a window state where an application associated with the window does not receive user interface inputs and/or does not render the window.