Thank you trevorc, however once again you're not understanding the issue I'm trying to find an answer to.
It's to identify which process has opened the workbook.

I already have a working system that works perfectly, what I would like is to just tighten it up a little.
Relying on a modal form with a timer means that, inevitably, some user will open the workbook, maybe while chatting with a colleague, and without looking at whats happening on the screen and then the wrong processes will run.