Forgot to mention that if the medium is created in HTML (nothing too fancy) it will work in any browser. When the medium autoruns it will open the buyer's default browser being the buyer's preferred browser. A better idea is to offer a Private Browser in the membership site. Configure it to display your own Ads, Popups, Embedded Download Tools, etc.
If you really want to get perky create a P2P Browser wherein users may access your Private Internet Network (PIN)! You need specialty software to run a PIN. The perk is once someone joins your PIN the buyer has access to private offers only available in the PIN. Think Herd Marketing. Where do you bed down the herd at night? In the Pen.. PIN
Jeffery 100% :-)