[support] Sharing content types and content across sites??

Hi,

I have two D7 sites and want to share users, certain content types and content for those content types across both sites.. Both use the same database with prefixed tables..

Using the "'prefix' => array(...." in the settings.php I have worked out how to share users between sites so they can login to either site an that works fine but now I want to share custom content types and content..

Lets say I had a "Tasks" content type and I wanted the "Tasks" content available in both sites but not "basic pages" or other content..

Is this possible?

I suspect it maybe an all or nothing situation which I could probably deal with.. So is there a way to share all content types and content between sites??

Thanks..

PS. I have looked into the "Domain Access" module but can't use it because it doesn't appear to play nicely with "Content Access" and "ACL"..