On Windows, should my child window get a WM_WINDOWPOSCHANGED when its z-order changes relative to one of its siblings?

This makes sense because there might be an arbitrary number of sibling windows, and it could be an unbounded amount of overhead to notify all of them. It also would be nearly impossible to come up with a consistent set of rules for delivering these messages to all the siblings given that some of the siblings could react by further shuffling the z-order. Do the siblings that haven't yet received the first notification now have two pending notifications?

Do they get posted or dispatched immediately? What if the queue grows and grows until it overflows?

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.