This technique typically involves two qualified/trained technical access inspectors connected via a dynamic rope, where one of the inspectors acts as the belay individual from a fixed position and the other inspects the structure while moving about and placing intermediate anchors.  The lead individual continues moving/inspecting until he/she has reached either an end point or a point near the end of the rope's length and will then set up an anchor station.  The lead individual then becomes the belayer for the second climber.