Also, how does the server 'tell the client'? I know there is such a thing as 'server push', but I didn't think this had ever made much of an impact.
The server "tells" the client (to delete the session cookie) in response to a request from the client. In the timeout case, the server can also refuse to handle the request.
Push isn't needed. If a web application really, really needs to know on a minute-by-minute basis whether the server thinks the client is logged in, use a hidden frame that refreshes on a periodic basis, and expire the session cookie on refresh. You can also include a javascript snippet to communicate "I've been logged out" to some non-hidden frame element.
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