user verification using rmi on cloud

Can anyone please explain this code ?? and also help me make the server side program

 try
    {
    String username=ClientLoginFrame_TextField_username.getText();
    String passwrd=ClientLoginFrame_TextField_Password.getText();
    String url="rmi://"+OWNER_ADDRESS+"/group";
    RemoteMethods methods=(RemoteMethods)Naming.lookup(url);
    String result=methods.verifyLogin(username,passwrd);

  if(result.equals("Login Failed"))
    {
        JOptionPane.showMessageDialog(this,"Wrong Username or Password");
    }