As we all know, Page.RunModal returns an Action so we can see what which action a user has taken on that page (Ok, Cancel, etc.). In my view, Report.RunModal should offer a similar return value that denotes whether a user has clicked Ok, Preview, Cancel, Preview, etc. on the request page, or whether no request page was shown.

Right now, I do not think there is a way to accurately detect outside the report whether a user has printed or canceled the report; preview can also only be detected inside the report. If this were to become a functionality, it would also serve to make functionalities like "No. Printed" much more centralized and maintainable.