New
#11
Desktop Window Manager (dwm.exe) is the compositing window manager that gives you all those pretty effects in Windows Vista: Transparent windows, live taskbar thumbnails
What happens in Vista is that applications write the picture of their window to a specific place in memory, and then Windows creates one “composite” view of all the windows on the screen before sending it to your monitor. Because Vista is keeping track of the contents of each window, it can add effects when layering the windows such as the transparency we’re all used to, as well as the live preview thumbnails..
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It should be the same in Windows 7.