Nobody's emailing you info except consultants who charge you. If you want
free info, post a question in the groups and read the replies.
To connect Access or Excel to your c code, create a dll with your c compiler
and place it on the user's pc, usually in c:\windows\system32. You can add
it to your library references or in code. If you want to code it, declare
each function in the library you need in a standard code module in Access or
Excel:
Public Declare Function functionname Lib "mylib" _
(ByVal arg1 As String) As Long
Public Declare Function functionname2 Lib "mylib" _
(ByVal arg2 As Long) As Long
There are several variations, you can make it private vs public, in a class
module vs standard module, different data types and names for the args, etc.
Just make sure it's in scope where you call the function.
Chris
Microsoft MVP