Zend Framework : Difference ways to redirect from controller

Zend Framework 1.8 Web Application Development

1. $this->_helper->redirector('index','profile');
2. $url = $this->_helper->url('index','profile','',array('smsg'=>'moved'));
$this->_helper->redirector->goToUrl($url);
3. $this->_forward('index','profile');
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Perform action with out view page in Zend Framework

$this->_helper->viewRenderer->setNoRender()

OR

$this->getHelper('viewRenderer')->setNoRender()