Informs all top-level windows that Desktop Window Manager (DWM) composition has been enabled or disabled.
As of Windows 8, DWM composition is always enabled, so this message is not sent regardless of video mode changes.
If an application processes this message, it should return zero.
A window receives this message through its WindowProc function.
The DwmIsCompositionEnabled function can be used to determine the current composition state.
|Minimum supported client
||Windows Vista [desktop apps only]
|Minimum supported server
||Windows Server 2008 [desktop apps only]