To move the light position in the interactive RTI, make sure the lightbulb icon in the bottom right corner is highlighted rather than dark then click and drag across the viewer.
To pan around the image, turn the lightbulb icon off, and click and drag across the viewer.
Use the layers icon to enable enhanced views of the RTI, including diffuse and specular (mathematical enhancements that remove colour and increase contrast), and normals (a false-coloured static view of the surface profile).
My grandfather has an extensive coin collection from around the world, spanning different eras, collected by our family and friends. Some even have little notes indicating their origins.
Over my time as an intern I've been using RTI to spot scratches, prints and other marks of use to get little glimpses of the hands that held them before.