User Mappings

Hello:

I have deployed a J2EE application to the Netweaver. Created an IView and it works fine. Now want to add UserMapping so that the user who is logging into the SAP portal can be mapped to the user for the application deployed.

it will be very helpful if someone points me how to define a system and add user mapping to the system.

Thanks for your help and time,

Regards,

Ravi