how to turn on application preview on windows 7 taskbar

Windows 7 includes an enhanced taskbar that addresses some of the issues of the past by minimizing clutter and putting commonly-needed functions in a single place. Especially egregious is the tray notification area: Over the years, hundreds and hundreds of applications have added often-unnecessary icons to the tray area, and many new PCs still ship with an over-abundance of crapware and their telltale tray icons. Unfortunately, some parts of the taskbar also contributed to the bloat and complexity for which Windows is now infamous. (And popular enough that it subsumed the old taskbar in Windows 7. One of these, the Quick Access toolbar, was popular enough that it became a stock part of the taskbar in Windows XP. The original Start button, tray notification area, and clock were expanded to include a plethora of other functions, including numerous customizations and an expanding array of optional toolbar types. The Windows 95 taskbar was a simple UI construct, but it grew bigger, more complex, and more powerful over time and subsequent Windows version. (Unless they were minimized, that is: Minimized windows appeared as buttons on the bottom of the Program Manager screen.) It was a response to people's increased ability and need to multitask in Windows, as previous versions of the OS provided no ready visual indication of how many windows were currently available. In Windows 95, Microsoft introduced the Windows Taskbar, commonly called the taskbar, as a way to manage open applications and other windows.

How to turn on application preview on windows 7 taskbar