Abstract: Described herein are techniques for a computing device executing a windowing system that automatically maintains a tiled arrangement of application windows on a first display and on a second display. A user interface element has indicia of applications that can be used to open the applications. Responsive to a first user input the user interface element is displayed on the first display, and while the user interface element is displayed on the first display, the windowing system maintains two or more of the application windows in a tiled arrangement on the second display. The user interface element may be part of a system user interface and may be implemented in a variety of ways. For example, it may be a full-screen set of application representations, possibly user selected, or a list of recently used applications, or a list of open applications, etc.

Abstract: Described herein are embodiments performed by a computing device capable of having a first display and a second display. The device may also execute a windowing system. Arbitrary applications execute on the computing device. Each such application has a corresponding application window managed by the windowing system. A start-projecting request may be received from an arbitrary one of the applications, and the windowing system may respond to the start request by generating, displaying, and managing a projection window. The application may generate and display content via the projection window. Responsive to the start-projecting request, display information about the first display and the second display may be used by the windowing system to display the projection window. A stop-projecting request from the application may cause the windowing system to terminate the projection window.