How does tracking work?

Hello –
Thanks for creating this great plugin. I’m wondering how exactly the plugin works. Specifically, if I set the Ad Revenue split to 50/50, does that mean that 50% of the times my Ad will be shown and 50% of the time Authors Ad will be shown?

For example: what if an author has the same Ad sense code as me? There would be no way to distinguish between the two of us if we have identical codes correct?