 Often, an auxiliary toolbar program will allow access to iconified windows.While the main aim of a window manager is to manage the windows, many window managers have additional features such as handling mouse clicks in the root window, presenting panes and other visual elements, handling some keystrokes (e.g., Alt-F4 may close a window), deciding which application to run at start-up, etc.Standardized protocols exist to allow normal clients to communicate with the window manager.