[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern int GetWindowThreadProcessId(HandleRef handle, out int processId);
[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern IntPtr GetWindow(HandleRef hWnd, int uCmd);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern bool IsWindowVisible(HandleRef hWnd);