Grid Grouper is a grid enabled version of Grouper, providing a web service interface to the Grouper object model. Grid Grouper make groups managed by Grouper available and manageable to applications and other services in the grid. Grid Grouper provides an almost identical object model to the Grouper object model on the grid client side. Applications and services can use the Grid Grouper object model much like they would use the Grouper object model to access and manage groups as well as enforce authorization policy based on membership to groups.
In Grouper/Grid Grouper groups are organized into namespaces called stems. Each stem can have a set of child stems and set of child groups with exception to the root stem which cannot have any child groups. For example let's take a university which is compromised of many departments each of which has Faculty, Staff, and Students. In terms of organizing the university in Grid Grouper, a stem could be created for each department, each department stem would contain three groups one for each Faculty, Staff, and Students.