Business Role and PFCG Role

Hi all,

I am new to CRM 7.0 Can someone explain What is a Business Role in CRM 7.0 and what is the relationship between Business role and PFCG role. What is the transaction Code to create a Business role.

And also I heard that there is no PCUI in CRM 7.0. Is it true and if so what is used in place of the PCUI

Thanks.

Neha.