A function key found on PC keyboards. When pressed with no other key, the Windows key displays the Start menu/screen. When pressed in conjunction with another key, it provides shortcuts to several Windows functions (see below). See Windows keyboard.PC Keyboards on Mac and LinuxIf a PC keyboard is attached to a Mac, the Windows key becomes the Command key. In addition, Linux and Unix operating systems generally support the key, but its purpose may have to be configured by the user.Windows Key Purpose Win Display Start menu/screen Win-D Display desktop Win-E Display Explorer Win-F Display Search dialog Win-R Display Run dialog Win-M Minimize all open windows Win-Tab Cycle through open apps (not XP) Win + Zoom in Win - Zoom out Windows 8 Only (Charms Bar Functions) Win-C Display bar Win-Q Display Search Win-F Display Search Files Win-W Display Search Settings.