In previous Windows versions (Windows 7, Windows XP etc), when new OS updates were available, Windows used to show a special icon in system tray notifying you of them. It was a very useful way to instantly know about new updates. You could click on the icon and open the Windows Update Control Panel item to see which updates were available and install them. With Windows 8 and Windows 8.1 Microsoft has removed the tray icon. Notices about updates being available are shown on the logon screen, which appears only for a few seconds if your account has no password protection, e.g. in case when you are automatically logging in to Windows. Fortunately, it is possible to get those notifications back in the system tray.