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While looking at action.php code, I found this useful information how to check whether a plugin exist and to access it.

global $manager;
$pluginName = 'NP_MyPlugin';
if (!$manager->pluginInstalled($pluginName))
         doError(_ERROR_NOSUCHPLUGIN);

$pluginObject =& $manager->getPlugin($pluginName);
if ($pluginObject)
        $error = $pluginObject->doAction($actionType);

I think it will be useful for NP_Batch I am planning to do soon.