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Quick dispatches from the life of a working programmer.
While you still call Mage::dispatchEvent to dispatch an event, Magento 2 has moved responsibility for event dispatch out of the Mage_Core_Mode_App class and into a stand alone Mage_Core_Model_Event_Manager class. If you’re debugging events the final dispatch method you’re interested in is
#File: app/code/Mage/Core/Model/Event/Manager.php
public function dispatch($eventName, array $data = array())
{
//...
}