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Server Push Applets............Please Help

 
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We're currently thinking about using Javascript from within a HTML frame to refresh itself
The scenario is something like this ,
The DB is updated some process, whenever the DB updates a particular table a message is
published to a JMS. What we wanted to do is some way to notify the HTMl/JSp that a DB is updated
and refresh the particular page provided if it open.
a) Is this a common implementation or is there another way to do this?
b) Can we use the Weblogic JMS implementation to accomplish this or do we need to consider a comercial implementation of JMS, like JMQ?
c) If we decided to do use applets, could we 'push' events out to the browser?
If you can share your ideas if possible source code it would be very great of you.
 
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