public static extern int GetWindowLong(Win32.HWND hWnd, int nIndex);
public static extern IntPtr SendMessage(Win32.HWND hWnd, int nMsg, IntPtr wParam, IntPtr lParam);
public static extern IntPtr SendMessage(Win32.HWND hWnd, int nMsg, IntPtr wParam, System.Text.StringBuilder lParam);
public static void SetFocus(Win32.HWND hWnd) { SendMessage(hWnd, WM_SETFOCUS, IntPtr.Zero, IntPtr.Zero); }