Clarification on Interaction by Category

[sciosciap]

Hi all - hopefully this is an easy one.

What Admin Analytics considers Participation is pretty intuitive on most items, but I am curious about what constitutes on participation in the following categories, which aren't mentioned on the "Analytics Page Views and Participations" page:

• Files
• Grades 
• Home Page
• Modules

Do comments count for the Grades section? And for Home Page, does it depend on what the Home Page is set to? I don't have a guess as to how a student participates in Files.

Any clarity is greatly appreciated!