The Details area for an ExternalLink object contains the following additional fields:
Object Type. This field contains either the ExternalLink object type or a subconcept within the ObjectType/ExtrinsicObject tree.
Select Concept for Object Type button. Click this button to choose a subconcept within the ObjectType/ExtrinsicObject tree that represents the content of the external URI.
A Display Content link under the External URI field. Click this link to view the contents of the URI in a browser window.