"Joel" wrote in message
...
Hello,

Is there a way to determine the functions that get called when adding to
floating point numbers within Excel?

For example, let's say I put 2.43 in A1 and 5.43423 in B1. Then in C1, I
do
a SUM(A1:B1). I would like to know the APIs that get called to make that
SUM
happen and the DLLs that are the host of those APIs.

Thanks.

Here's something that you may find useful, An add-in written in C#. If you
want this function to work like Excel's sum, you need to sete a refernce to
Excel and modify the parameters.

http://www.thecodeproject.com/dotnet/excelnetauto.asp

/Fredrik