You are very welcome.

It took me a while to get to that solution because it took me a while to figure out how OneNote knew that a Notebook was "open". It had to keep track of it somewhere and that is how I discovered that it was the registry which is where a lot of apps keep track of what they are doing.

I would caution anyone who tries this solution, or any other solution that requires working with the registry to BACK IT UP first, just in case.

WesternGuy