public static void main(String[] args) {
        // TODO Auto-generated method stub
        BufferUI window = new BufferUI();
        window.frame.setVisible(true);
    }

    private static final int PORT = 65000;  // random large port number
    private static ServerSocket s;

    // static initializer
    static {
        try {
            s = new ServerSocket(PORT, 10, InetAddress.getLocalHost());
        } catch (UnknownHostException e) {
            // shouldn't happen for localhost
        } catch (IOException e) {
            // port taken, so app is already running

            System.exit(0);
        }
    }