How can I push content with http?

Hallo, I am writing a video conference control web application, the web page is based on http servlet. Wenn the status of conference is changed (which trigged by a httpSessionAttributeListener), the web page has to refreshed in inform user. Is there any standard way to force browser to refresh or push some content to client?

You can google for Pushlets.
Basically, they are Servlets that never close the output stream to the client, holding it open continuously. So you can check for the changes you want then push content to user when the change occurs.
Another option would be to have a javascript that requests a page from the server, whose only job would be to determine if the change occured. Then, based on the response of the server, refresh the page or do a document.location to someplace else.

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