[DllImport("user32.dll", SetLastError = true)]
        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, IntPtr windowTitle);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
        static extern IntPtr SendMessage(HandleRef hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

        private const int WM_CHAR = 0x0102;

        public static void SendETCommand(string Command)
        {
            string command = Command + '\r';

            IntPtr parenthWnd = FindWindow("ET WinConsole", null);
            if (parenthWnd != IntPtr.Zero)
            {
                IntPtr hWnd = FindWindowEx(parenthWnd, IntPtr.Zero, "Edit", IntPtr.Zero);
                HandleRef hRef = new HandleRef(null, hWnd);
                IntPtr ptrlParam = new IntPtr(1);
                for (int i = 0; i < command.Length; i++)
                    SendMessage(hRef, WM_CHAR, new IntPtr(command[i]), ptrlParam);
            }
        }