refreshing the defaultEditingContext

Hi guys,
I've been trying to optimize my application a little as I had some  
RSS feed which was actually creating a session and finally as RSS  
readers update themselves every x minutes, I just couldn't softly  
restart the instance.
So I moved the RSS component using the defaultSharedEditingContext,  
making sure no session was created. So this part was ok so far.
But trying it I saw that the data from the  
defaultSharedEditingContext didn't update...
I can afford some delay for the update like minutes, but it's been 5  
hours now:(

How should I make the sharedEC to update itself? The data are being  
edited/added using another WOApplication, so maybe the other  
application could "call" the sharedEC to make it refresh...

Or do:
setRefreshesRefetchedObjects(true);
on the fetch specification should work?

Thanks a lot for any tip:)

Xavier