This video shows how to develop an RTD Server using Add-in Express for Office and .NET: http://add-in-express.com/net
The video explains the basics of real-time data servers and how to create the RTD server project, return a value to Excel and see how the RTD server works. Read more about creating Excel RTD servers with Add-in Express here (VB.NET, C#, C++.NET):
http://add-in-express.com/rtd
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