Business Objects federation in BI 4.X

Hi Experts ,

Environment : SAP BW 7.4 ,BI 4.X , Reports :Webi and Xcelsius Dashboards.

Different users has different authorizations.BO and BW Servers are in Singapore  and reports accessible across globe.

BO reports accessing is slow in upcountry's because of network.we found Federation in BOE XI 3.1 - Business Intelligence (BusinessObjects) - SCN Wiki

will help.We couldn't found this approach for BI 4.x .

Is clustering and Federation are same ?

How can this help ?

What are the pre-requisites for this?

Thank you for valuable inputs..