read this

[greg prost]

does anyone know any good sites to teach me about addins,
so far i know nothing about them and they look very
useful.

[Tom Ogilvy]

These are for normal Excel Addins (xla files).

http://www.microsoft.com/officedev/index/apps.htm
Distributing Microsoft Excel 97, Word 97, and PowerPoint 97 Solutions (March
3, 1997)

http://www.microsoft.com/exceldev/tips/addins.htm
Protecting the Code in an Add-in

old: http://msdn.microsoft.com/library/techart/XLCrAddns.htm
http://msdn.microsoft.com/library/en-us/dnexcel9/html/xlcraddns.asp
Creating Add-ins in Microsoft Excel 97

http://support.microsoft.com/?id=167909
XL: Securing Visual Basic Code in Microsoft Excel

http://support.microsoft.com/?id=156942
XL97: How to Create an Add-in File in Microsoft Excel 97

Perhaps you are talking about COM Addins:

http://support.microsoft.com/?id=238228
HOWTO: Build an Office 2000 COM Add-In in Visual Basic

http://support.microsoft.com/?id=256624
HOWTO: Use a COM Add-In Function as an Excel Worksheet Function

http://msdn.microsoft.com/library/en-us/dnovba00/html/Add-insDetail.asp
COM Add-ins in Detail
Extending the Capabilities of O2K and the VBE

http://msdn.microsoft.com/library/en-us/modcore/html/dewlkWalkthroughCreatingCOMAdd-in.asp
Microsoft Office XP Developer
Walkthrough: Creating a COM Add-in with VBA

http://support.microsoft.com/?id=291392
Q291392 - INFO: Excel COM Add-ins and Automation Add-ins

http://support.microsoft.com/?id=285337
Q285337 - HOWTO: Create a Visual Basic Automation Add-in for Excel 2002
Worksheet Functions

--
Regards,
Tom Ogilvy

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