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Hi everyone, I was just wondering if it is possible to manipulate a window so that it isn't responding. I just need this for testing purposes (a little app that checks if the selected window is still responding) Also i think i can remember a function called _WinAPI_IsHungApp() or something along those lines. Correct me if im wrong. The App that would check if the window is still responding would use the SendMessageTimeout function (https://msdn.microsoft.com/de-de/library/windows/desktop/ms644952(v=vs.85).aspx) or the built-in _SendMessage() function to send the "WM_NULL" message and then get a response or something like that? I dont quite know what the "WM_NULL" message does to the Window but thats why i would like to have a hung up testing window.