The present invention provides an interface, system, or method for displaying a window on a display in which a thumbnail corresponding to an application window is capable of being modified based on modifications in the application window. The modifications of the thumbnail may be accomplished in real-time. Also, the present invention provides an interface, system, and method for displaying a window or a thumbnail on a display in which a Desktop Window Manager (DWM) registers a source window and a destination window and/or may update or modify a thumbnail associated with the source window. Special effects may be applied to the thumbnail. The present invention further provides a method for registering and/or modifying a thumbnail and its properties or maintaining a list of thumbnail registrations.