When the label is clicked, it locks the star and activates a series of clickable buttons located below the main display area. You can also lock another star by clicking its label. The other resources will be shown in the main display area. Point the hilighted label to restore the map for the locked star. Numerous links to other sites.
Information is quite technical.
Skyview DSS images from Skyview Can take some time to arrive. You can zoom in on the field by clicking the button again. Provides access to other resources as well. In A close-up view for some fainter stars. Animation showing each reference circle.