How portlet producers initiate refresh/push to consumers on demand

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Hi All, i am new to the oracle Webcenter portlets:

My requirement is my Portlet Producer serves N number of consumers . I do need to refresh or push content to those consumers whenever changes occur at my producer .

My questions are :

1.How to keep track of all active consumers for my portlet-producer ? what technique to use ?
2. How producer could communicate with consumer and refresh or push the content?

I was able to refresh the consumer(Consumer side request initiated) by setting time interval in javascript(Jquery) and making ajax request to the producer. But i do like to know how can the refresh or push initiated from my producer?

I'am a beginner in Oracle webcenter so Guide me regarding this in detail.

Thanks in advance