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#include <windows.h> int main() { HWND my_window_handle = nullptr ; for( int i = 0 ; i < 100 ; ++i ) { if( my_window_handle ) ::ShowWindow( my_window_handle, SW_SHOW ) ; // ... if( my_window_handle == nullptr ) my_window_handle = ::FindWindow( nullptr, "some top-level window's title" ) ; // ... if( my_window_handle ) ::ShowWindow( my_window_handle, SW_HIDE ) ; // ... } }