autohide facility enables menubars to disappear when the pointer is moved away from the edge of the screen. Borders A border is a window decoration component provided by some window managers, that appears around the active window. Some window managers may also display a border around background windows. Context Menu Some window managers provide a context menu that appears when an alternative click event is applied to a desktop component. Desktop Wallpaper Some window managers provide a desktop wallpaper facility that displays a background picture in the root window. Focus Stealing Focus stealing is a facility some window managers provide. It allows an application not in focus to suddenly gain focus and steal user input intended for the previously focused application. Iconification An iconification facility lets users minimize running applications to a desktop icon or taskpanel icon. Joined Windows Some window managers provide a joined windows facility that lets user join application window frames together. Keyboard Equivalents Some window managers provide keyboard equivalents that enables the keyboard to replicate mouse functionality. Menubar A menubar provides the facility to launch programs via a menu and may contain additional facilities including a start button, a taskbar, and a system tray. Menu Panel A menu panel a component of some window managers that provides the facility to launch programs using a menu. A menu panel is similar to a menubar, but appears as a floating panel, rather than a horizontal or vertical bar. The menu panel may contain additional facilities including a start button, a task panel, and a system tray. Mouse focus The mouse focus model determines how the pointing device affects the input focus within the window manager. The focus model determine which component of the graphical user interface is currently selected to receive input as the pointer is moved around the screen. Mouse warping Mouse warping is a facility that centres the pointer on the current application as it is made active. Multiple Desktops A window manager may provide a multiple desktops facility. This enables switching between several root window desktops. This prevents clutter of the root window, because applications can run on different desktops. Pager Some window managers provide a pager tool that provides the facility to switch between multiple desktops. The pager may appear as an onscreen window or as a gadget in the taskbar or taskpanel. Plugins Some window managers have a modular construction that enables plug-in