In the default view, each program appears as a single, unlabeled button—even when multiple items for a program are open—for a clean and uncluttered look.

To preview open windows with Aero Peek :

  1. Point your mouse at a taskbar button
  2. The thumbnail previews of any open windows associated with that button appear above the taskbar
  3. To open a window you are previewing, click its thumbnail

To customize your Windows 7 experience, you can also change how buttons appear on the taskbar and change how icons appear in the notification area of the taskbar