A method and apparatus for inspecting the outer surfaces of a building, structure, or vessel without placing at risk either people or large mechanical structures, or people and property at or near the base of the building, structure and vessel. Keyed certificates are used to authenticate remote computers. The composition is applied to a surface and allowed to evaporate leaving a coating of antimicrobial polymer. The first element is adapted to be inserted into vasculature of a patient so that the device spans and is supported by a point of bifurcation. An end of the transverse shaft extends through one of the two side bars and this end is rotatably mounted in a seat side part of the seat part, so that the transverse shaft defines a pivot axis about which the backrest is pivotable relative to the seat part.