Solution Manager 4.0 -> S-user configuration?

Dear community.

I've got a little problem while configure our solution manager 4.0 system.

The satelite systems are configured and implemented and now I want to configure the Service Connections. So that I can open the Service Connections for sap support out of the solution manager.

For that work I have to configure a s-user in the transaction "dswp -> edit -> global settings -> connection to sap" to connect to the sap service market place and to update the systems data.

My problem is that i found anywhere a description what I need for a kind of user and which permissions he should have.

Further the s-users are personlized. When I create a s-user for the solution manager, it shouldn't have a relation to a real person, because it is just for the system. What can i do in that case, when I have to create the user?

I hope you can understand my problem and give me a tipp to resolve it.

kind regards

C. Erdmann