title: Internal forward action in CodeIgniter
body: <p>In Zend Framework, we can easily forward to an action in another controller using the <strong>_forward</strong>().</p>
  
  <p>How to simulate this in CI? CI only have <strong>redirect</strong> but this is not I want, I don't want user to see the URL has changed in their browser.</p>
  
  <p>Any idea to implement it?</p>