StarTeam Extensions includes sample requirements APEs.
These APEs display the selected requirement. If this requirement was originally exported from CaliberRM, it will be displayed in a read-only mode. However, clicking the CaliberRM button or the Launch CaliberRM button starts the CaliberRMViewer, and if the user has a license to CaliberRM, allows the user to start CaliberRM and, using CaliberRM, edit the requirement.
The APE and launcher for the viewer are found in the JBuilder project named Requirement.jpx.