FAQ: Is it possible for a user to have permissions to create connections only in the Admin Console and not in MRS or Analyst Service in IDQ?
Informatica Admin Console
Informatica PowerCenter on Grid for Greater Performance and Scalability ~ Data Integration Solutions
FAQ: Can an Administrator user change the password and have the change globally reflect in all existing services without manually updating the password in PowerCenter?
Creating Informatica PowerCenter Repository Service - Informatica tutorial