Desktop Window Manager (DWM, previously Desktop Compositing Engine or DCE) is the window manager in Windows Vista, Windows 7 and Windows 8 that enables the use of hardware acceleration to render the graphical user interface of Windows.
It was originally created to enable portions of the new "Windows Aero" user experience, which allowed for effects such as transparency, 3D window switching and more. It is also included with Windows Server 2008, but requires the "Desktop Experience" feature and compatible graphics drivers to be installed.
Read more about Desktop Window Manager: Architecture, Redirection, Hardware Requirements
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