I am pulling all my hair off... Have been searching every thread, would appreciate if someone can point me to a working example.
Accroding to the doc: https://bitbuc
  /*echo Modules::run("controller name of a module which you want to call/and its.. function name");*/
echo Modules::run("Second/callit");
or
$this->load->module('Second');
$this->second->callit();
But.. the controller name shold be different .. from one module to another module..
                       **(parameter passing)**
        echo "<hr>";
       //echo Modules::run("controller name of a module which you want to call/and its.. function name");
         $data="peter";
      echo Modules::run("Second/callit",$data);
      echo "<hr>";
      $this->load->module('Second');
     $this->second->callit($data);
      echo "<hr>";