Under Windows 7 and with WDDM 1.1 drivers, DWM only writes the program's buffer to the video RAM, even if it is a graphics device interface (GDI) program. By comparison, the stacking window manager in Windows XP and earlier (and also Windows Vista and Windows 7 with Windows Aero disabled) comprises a single display buffer to which all programs write.ĭWM works in different ways depending on the operating system (Windows 7 or Windows Vista) and on the version of the graphics drivers it uses ( WDDM 1.0 or 1.1).
The Desktop Window Manager is a compositing window manager, meaning that each program has a buffer that it writes data to DWM then composites each program's buffer into a final image.
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