interface Requests_Hooker {
* Register a callback for a hook
* @param string $hook Hook name
* @param callback $callback Function/method to call on event
* @param int $priority Priority number. <0 is executed earlier, >0 is executed later
public function register($hook, $callback, $priority = 0);
* @param string $hook Hook name
* @param array $parameters Parameters to pass to callbacks
* @return boolean Successfulness
public function dispatch($hook, $parameters = array());