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[eluser]got 2 doodle[/eluser]
I think what you are looking for is to extend the controller class.

If you look in /system/libraries/Controller.php this is the main controller class.

If you extend the controller in /system/application/libraries/MY_controller.php

Then if you build (extend) all of your controllers based on MY_controller.php then any changes made to MY_controller.php will affect all of your controllers.

Take a look at BackendPro (search the forum) it does this extensively.

Code:

class Site_Controller extends Controller
    {
        var $_container;
        function Site_Controller()
        {
            // Call parent constructor
            parent::Controller();
        
            // Display page debug messages if needed
            /*if ( is_superadmin() AND $this->preference->item('page_debug'))
            {
                $this->output->enable_profiler(TRUE);
            }*/
            
            // Set site meta tags
            //$this->page->set_metatag('name','content',TRUE/FALSE);
            $this->page->set_metatag('content-type','text/html; charset=utf-8',TRUE);
            $this->page->set_metatag('robots','all');
            $this->page->set_metatag('pragma','cache',TRUE);
            
            log_message('debug','Site_Controller Class Initialized');
        }
    }

This does some default stuff..

class Public_Controller extends Site_Controller
{
function Public_Controller()
{
// Call parent constructor
parent::Site_Controller();........

class Home extends Public_Controller
{
function Home()
{
parent:ublic_Controller();
}

function index()

And so it goes...
...like an onion.

hope this helps
doodle