Comments:
We have written an analysis of the Excel’s RTD function.
http://www.willowsolutions.com/news/news_rtd.shtml
Also Microsoft has information about building a RTD server in a knowledge base article which includes lots of sample code.
http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q285339
Microsoft also offers a download on the RTD function
http://www.microsoft.com/downloads/release.asp?releaseid=32838
Hope this information helps.
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