yes, I used "StockListDemo"
I tested on client with info
Windows 2003
IE 7
No toolbar or addon

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I modified StockListDemo (C# 2005) => remove class ExternalFeedProducer (cause if each small class that create 1 connection to database or read file => use more resource of server, so I keep only ExternalFeedProducer )
and set main loop in class ExternalFeedSimulator

ExternalFeedSimulator => 2 threads
1 thread GetData => select data from database => add to queue
1 thread Run => main loop => wait item in queue => objListener.OnEvent ...

When I closed IE,it suspend long time like the first time I load page
maybe the connection to database in progress?
When close IE, Unsubscribe event occurs ?
have a other way to reduce CPU usage in client?

thanks a lot!