multi-site cart

[eluser]theprodigy[/eluser]
If I set it up in the above manner, is cURL-ing my only option for setting and retrieving data?

If the shopping cart is setup as the bulk of the processing, and I want to send and retrieve data from it, is there a way other than curl-ing to do this?

Is there a better way to set this up?

All info is appreciated.