User and Resource Management
In a production context a grid system should have maintain a register of both the approved users and resources. This is essential to preserve security within the system as well as the quality that the service provides. Management of user credentials is a service that though done centrally may also be done by a site, possibly as an internally facing service that is available to others.
NGS Site Level Services
For further information on the NGS software stack, please refer to the NGS Site Level Services reference document.