I'm using VB.NET 2k3 and I want to be able to code a button to open an
existing Excel Application.  Anyone know where I can find this info or want
to tell me the lines to code?  All I can find on the net is how to create new
excel apps.

Try the following:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/odc_vsto2003_ta/html/excelobj.asp


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