How do med schools know if a course is online?

How do med schools know if a course you took is online? I believe for my undergrad university (western) our transcript does not show whether a course is online or not. Is there a separate section on certain schools' applications where you have to say which courses were online?

I know most schools accept online courses but I heard some frown upon it so I would like to know if I should limit how many online courses I take.