OT: How to recognize a double layer drive?

[Tiemo Hollmann TB]

Hello,

I am to publish an app on a double layer DVD-ROM. Now I came to the question
of the system requirements. Does anybody know how to recognize, if my
DVD-drive can play DL discs? Or can all DVD-drives play DL discs since the
"beginning". I really don't know, but would like to tell my customers if not
and how they can check, if they have a compatible drive.

Any experiences with this? Win/Mac

Thanks for any idea

Tiemo