Class Name

// file : controllers/mvc.php
class MvcController extends Thule_Contorller {
}

// file : models/mvc.php
class MvcModel extends Thule_Model {
}

// file : application/libraries/lib.php
class Lib extends Thule_lib {
}

// file : application/helper/auth.php
class Auth extends Thule_Auth {
}

Call Controller

$this->loadController('controller');
$this->Controller->Hello();

Call Model

$this->loadModel('model');
$this->Model->Hello();

Call helper

$this->loadHelper('text');
$this->Text->Hello();