The non-common attributes between projects or artifact types are displayed with an asterisk mark.
Saved cross project queries are accessible like all other saved queries; from the Query artifacts tab on the Project tracker page of your project. To run a saved cross project query, click the name of the query. You can edit the cross project query by clicking the Edit in line with the cross project in the Edit saved queries table. For more information on saved queries see the Edit saved queries help documentation.