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On May 25, 2009, at 9:14 PM, Marco Antonio Abreu wrote:

thank you for your suggestions. But the unfortunately we do not have access to do anything starting from the database or the O.S.. Only to you know, Windows with MS SQL Server. This server is not in our domain, only client's
and they don't want to change anything in their servers (for now).

I'm not very familiar with MS SQL Server, but it appears to have something called "Query Notifications":

"allows an application to request a notification from SQL Server when the results of a query change. Query notifications allow programmers to design applications that query the database only when there is a change to information that the application has previously retrieved"