Wait dialog on rpc interaction

Hi to all,

i am facing a problem while developing a web application. I have some rpc interactions with the server (appengine) and most of them are really time consuming as i am having some data analysis. Due to the delay of the response, most of my beta testers press more than one time the request button and so does this duplicates the analysis phase. How do i popup a dialog box or whatever in order to notify them that we are processing his/her request and he has to wait for a while?

Thanks in advance,

Stefanow Antaris

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