Enterprise Services Queries

Hi All,

All of us know about enterprise services. I've few queries regarding that......

1) Can I access Enterprise Services without CE 7.1 or PI 7.1?

If no, it is mentioned that SAP has delivered some

enterprise serevies in 2006 also, then how they were

consumed at that time?

2) Who is providing the implementation for these services?

SAP or partners or customers?

3) Can we define a new enterprise service? If yes, any certification is required?

Technology------>

4) How these services would be impllemented ABAP or JAVA?

5) Is the tecnology for accessing/consuming enterprise services is same as web services?( soap,xml,http,wsdl)

Waiting for the answers.

Regards,

Piyush