1. A method of operating a see-through display system, the see-through display system comprising a see-through display screen, a gaze detection subsystem configured to determine a direction of gaze of each eye of the user, and an outward facing image sensor configured to acquire images of a background scene relative to a user of the see-through display system, the method comprising: acquiring an image of an external display screen located in the background scene via the outward facing image sensor; determining via the gaze detection subsystem a location on the external display screen at which the user is gazing; obtaining an identity of an object displayed on the external display screen at the location determined; and performing an action based upon the identity of the object.