what's the difference between ShowWindow and ShowWindowAsync?

Question

I am wondering what's the difference between those two Windows API method?

In which situation, we need to call ShowWindowAsync?

Answer 1

ShowWindow() sets the visibility state of a window created by the calling thread, ShowWindowAsync() is used when the calling thread did not create the window.

You would need to use ShowWindowAsync() in a multithreaded application when changing the visibility state of a window from a different thread.