find a function in cakephp

I am learning cakephp. can someone explain me what this is for

$this-&g开发者_Python百科t;RunFunction->bindModel(array('belongsTo'=>array('Audio','Image','Video')));

where would I find the RunFunction. Its in a plugin folder of cakephp

Is it a model in the plugin? The models would be found in app/plugins/pluginname/models...

So app/plugins/name/models/run_function.php I guess.