Task Queue Ambiguity

Hi,
I have two questions that are not clear from the specs
- As per the specs (http://www.w3.org/TR/html5/webappapis.html#event-loops) there is one event loop per unit of related similar origin browsing contexts. Are the task queues between these browsing contexts shared or every browsing context has it's own separate queues? 
- Directly reachable browsing context with different origin will have different event loop. I am assuming that in that case every browsing context will have it's own task queue. Is that correct?
Thank you.Regards,Essam