Thank you Richard,
I think that program make the calculations from reading a routine implemented in Mathcad.
What I want to do is in the opposite direction: I want to know if it is possible to call a function, previously builded in Visual Studio, from Mathcad and then be able to manipulate the data gathered from that visual Studio function in a mathcad worksheet.
Please, correct me if I misunderstood your post.
Diego.