Can MarketPress work from more than one site

Hi Folks,

I am wondering if I can use MarketPress from more than one site without duplicating the effort.

Here is what I have in mind:

Site A and Site B are "product" websites that are focused to different groups, but share common products.

Site C is a SSL site where I want to have a secure checkout. It could also be used by the visitor to add suggested (related) products to their cart.

The key here is that I want to use Site C for checkout from both Site A and Site B.

If it is easier, I can set all the sites up in Multi-site (assuming there are no problems with that and the SSL for Site C).

The primary goal is to only have to setup the products ONCE (I'm guessing in Site C) and then to be able to display the info for them on Site A and B with SSL checkout on Site C.

All three sites can be on MarketPress theme if need be.

Any advice or ideas are appreciated!