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Hello

I want to do Window itself transparently

Which is the sample which I want to use DWM for?
Will even Windows XP be usable?

I wait for an answer.

There is a CExtDWM class that provides an easy-to-use wrapper around the Vista DWM API. Mainly it is used internally by some of Prof-UIS components including the Ribbon control but you can use it in your code too.

Here is how you can check if the OS is Vista and DWM is enabled:

if(        g_PaintManager.m_bIsWinVistaOrLater
    &&   g_PaintManager.m_DWM.IsCompositionEnabled()
    )
{
    . . . 
}

You can read more about using DWM in the MSDN. Please note Windows XP does not support DWM API.