Windows 7 Taskbar Improvements
DirectX improvements
The Windows 7 Taskbar team has been working to improve the taskbar interface. Notable are improvements on managing running applications. The same thumbnail preview on programs in the taskbar is still there but when you engage with the thumbnail then you will have a full screen preview. There is also a recent history list available on every running application in the taskbar. Also applications can be designed to take advantage of targeting multiple thumbnails for applications like Excel where there may be several files open. One thumbnail could be presented for each open file. This behavior has to be implemented by the software developers.
The GDI and GDI+ interfaces have been improved but the major focus is on moving application support to DirectX which is clearly becoming the new clear choice for graphics drawing surfaces. Microsoft developers implied that the GDI+ is based on old graphical concepts unlike the DirectX which is simply more modern.
Some improvements with DirectX and how it works with the DWM (Desktop Windows Manager). Vista has been storing copies of Windows in the memory on the main motherboard and as well in the video card memory. Windows 7 will improve on how the DWM works. The DWM basically draws all the windows in memory including video surfaces. This is how Vista can show you a thumbnail of Windows Media Player with full video.
http://www.microsoft.com/windows/windows-7/
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