SRM system architecture queries

Hi Gurus,

We are on SRM5.0 using classic scenario. Our backend system is ECC6.0 and we are using CCM2.0. Can you enlighten us from the following:

1. SRM system architecture

2. Inbound/outbound interfaces

3. SRM system document

4. Cross-client configurations

5. RFC setting

6. Number of objects/programs

Your inputs are very much appreciated.

Thank you.