A window is a rectangular onscreen frame through which one can view a document, worksheet, database, drawing, or application program. This functions as a frame through which users can view their work on the screen. It generally has a control menu and control buttons, which enable the user to minimize the to an icon, to maximize (zoom) the so that it occupies the whole screen, or to restore the previous size. Windows can be moved by dragging on the sidebar and sized by dragging edges or corners. Scroll bars, scroll boxes, and scroll arrows are generally provided to enable the user to view documents that are larger than the available display space. In Microsoft Windows, each application contains the applications command menu; in Mac OS, an application’s command menu appears at the top of the screen, independent of the application windows. See control menu, maximize, minimize, scroll arrow, scroll bar/scroll box, title bar.