The Project Explorer arranges activities hierarchically by stream and by project. When you navigate to and select your stream, the Details pane lists the activities in the selected stream.
The Project Explorer Details pane shows only the UCM activity objects that are in the currently selected stream.
In a project that is enabled for Rational® ClearQuest®, each activity in a stream is linked to a record in the associated Rational ClearQuest user database for the project.