Guide use custom Config in FuelPHP

index.php

<?php

// load file fuel/app/config/system.php and groupname = name of group config, TRUE = set group config same filename        
Config::load('system', 'groupname');

// set value for key active in group groupname
Config::set('groupname.active', 'ok');      

// delete key active in group groupname
Config::delete('groupname.active');

// save group 'groupname' system to file system.php
Config::save('system', 'groupname');

// example get value of config
Debug::dump(Config::get('system'));

system.php

<?php
return array(
  'active' => 'ok',
  'text'   => 'this is text',
);