Systems and methods are provided for controlling the appearance of application windows on a computer display screen. A user identifies either an application window currently running on the computer or a new application to be started. The user also identifies a size, shape, and screen location by inputting a geometric shape, such as by drawing a rectangle with a pen or stylus input device, on the display screen. The appearance of the application window is set based on the geometric shape. The application window is resized and moved, for a currently running application, or created, for a new application, on the display screen.