How to just invalidate the background of window, not any pixel of the client area?

You can't. The background is painted IN the child area of the window. IF the window uses child controls to draw objects (in its client area) then you could use the WS_CLIPCHILDREN style to ensure that the background painting of the parent window does not over-paint any children.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.

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