The so-called "Comet" technique is perhaps what you are looking for:
http://ajaxian.com/archives/comet-a-new-approach-to-ajax-applications

//Adam

On 31 Juli, 02:03, Blessed Geek <blessedg...@gmail.com> wrote:
> In Flash, I could create an async socket.
> Which is very useful because it allows server pushing data
> asynchronously (i.e. on the events of new data is available or changes
> in data) to the client without the client's constant initiative.
>
> Does GWT have a means to create async sockets?
>
> Actually, how would you create an browser-side async socket in
> javascript?
>
> I know of a way some people play cheat by polling. Using the browser's
> javascript, they create a so-called listener in which you declare the
> url you wish to listen to and the interval of polling. And on the
> listenee side, you have to install a message pusher that would listen
> for the browser's "listener" polling.
>
> I think that is cheating because the actual listener is the server not
> the browser, because the browser is initiating data transfer by
> polling and the server listens to the poll.
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