Portion of Magento IndexController.php that shows how to fire an event

IndexController.php

<?php
/**
* Lines 62 to 75 of IndexController.php that 
* show how to fire an event
* 
* Other code is removed for brevity
* 
* @author Magento
*/

//Starting at line 62
Mage::dispatchEvent('before_news_item_display', array('news_item' => $model));
 
$this->loadLayout();
$itemBlock = $this->getLayout()->getBlock('news.item');
if ($itemBlock) {
$listBlock = $this->getLayout()->getBlock('news.list');
if ($listBlock) {
$page = (int)$listBlock->getCurrentPage() ? (int)$listBlock->getCurrentPage() : 1;
} else {
$page = 1;
}
$itemBlock->setPage($page);
}
$this->renderLayout();