Thanks for your help NevadaMark.
I also really appreiate the C++ software and the opportunity to learn.
I am going to follow through but a couple of things have slowed my reply. I take it that the general intent is to follow Notes.txt. True?
I'm not familiar with COM so I wasn't sure what was and wasn't important. We don't have admin rights by default so it looked like I was going to have to get this organised to proceed.
Unfortunately, I wasn't set up to try the VB project by itself, which meant I couldn't do an independet test/check. Also, we run 64 bit MATLAB so that ruled out this testing option. Pity.
Again, I appreciate all of your help.