EVR is designed to work with Desktop Window Manager.
It does not use the Desktop Window Manager, and does not require a WDDM driver.
The software relies heavily on the Desktop Window Manager ( or DWM, part of Windows Aero ).
Users need to have a DirectX 9 capable video card to be able to use the Desktop Window Manager.
Windows Vista and Windows 7 allow the user to disable Desktop Window Manager by selecting the Windows Basic appearance settings.
Multi-plane overlays allow the Desktop Window Manager to automatically render portions of the desktop into overlays, saving power in more circumstances.
EVR is designed to work with Desktop Window Manager and supports DXVA 2.0, which is available on Windows Vista and Windows 7.
It was one of the first builds to include the Desktop Composition Engine ( DCE ), which later became the Desktop Window Manager ( DWM ).
The Desktop Window Manager still requires at least a Direct3D 9-capable video card ( supported with new device type introduced with the Direct3D 11 runtime ).
The Desktop Window Manager in Severe delays in the development of Longhorn caused Microsoft not to debut its 3D compositing window manager until the release of Windows Vista in January 2007.