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function checkRevoManager () 
{ 
    require_once 'config.core.php';
    require_once MODX_CORE_PATH . 'model/modx/modx.class.php';

    $modx = new modX();
    $modx->initialize('web');

    if (!$modx->user->hasSessionContext('mgr')) 
        die('Access denied.');
}