ASP.NET, cross site Session state

I need to figure out a way to check if a session in a site is up or not.

i mean: I have two application that run on the same IIS. In a page of the first app there's an iFrame in witch lies a page given by the second app... the problem is that any postback or asyn开发者_如何学Goc calls ont the iframe doesn't reset the second app timeout.

I tried doing a request clientside on the 'readystatechanged' event, but it works only for the postbacks and not for the asyncs. I'm wandering if there is a 'polling' way to check the Session state of the iFrame application from the main page...

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You could implement your own session state provider that stores the session in a in a SQL database or some other external storage. Example here: http://msdn.microsoft.com/en-us/library/ms178588.aspx