Changes the text of the specified window's title bar (if it has one). If the specified window is a control, the text of the control is changed. However, SetWindowText cannot change the text of a control in another application.
BOOL SetWindowTextW( HWND hWnd, LPCWSTR lpString );
int SetWindowText(int hWnd, Pointer<Utf16> lpString) => _SetWindowText(hWnd, lpString);