This feature applies the Aero Peek technology to taskbar thumbnails. If you hover over an application button in the Windows 7 taskbar, thumbnails of open windows associated with that program pop up.
If you then hover over one of the thumbnails, the full corresponding window on the desktop (be it a Word doc, a browser, an IM session) will come to the forefront and all other windows will turn to glass and become transparent.
Windows Media Player taskbar controls
A Windows Media Player (WMP) mini-viewer works with the new Windows 7 taskbar. You just need to hover over the Windows Media Player button on the taskbar after WMP is launched and a good-size thumbnail window shows up with options for controlling your WMP and playing songs.
The controls provided in the thumbnail are basic - Previous Track, Play/Pause, Next Track - but the quick access to music from the taskbar is a nice time-saver.
See also: Turn your XP or Vista PC into Windows 7
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