refresh problem

Hi,

I have application in GWT that show different kind of data or action according to client choice.
In one of the page there is list jobs and when client choose a job he get the current info of the job.
The data is taken from database.


Is there a way that the server will notify the client when there is new data ?
Is it possible that only the relevant client will get this event ?

Is there a way to tell GWT to refresh only the table every period of time ?

Thanks

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