ASP.NET 2.0, just like ASP.NET 1.x, php, coldfusion, jsp, etc... all still work in the world of HTML. Push technology never went anywhere when it was first talked about. And today, you still can't "push" anything to the browser. You CAN write applets or other client-resident programs that refresh, poll, monitor, listen to a server, but ultimately those are not really ASP.NET.
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Peter