About B2B scenario?

Hi Experts,

I am new to B2B sceanrios. I understand the basics that it is for communicating between two external systems, i.e outside the firewall.

But for using the B2B scenarios what kind of adapters can be used? And i am not able to find any test scenarios for this. Can you give me link or document showing the step by step procedure for B2B scenarios?

Thanks in advance

Regards,

Lavanya R