Improvements in program viewing apparatus and methods, some of which are now commonly referred to as personal video recorder and program guide features in television sets, set top boxes and other video devices. The method includes providing the target having a target frame of reference, a retroreflector and a body. In this case, the transistors of one conductivity type can be controlled by means of a push-pull signal and the transistors of the other conductivity type in a respective one of the two signal paths can be controlled by means of a signal at the output of the respective other signal path. In a second aspect, the method and system include means for storing the at least one image in a second format and a printing device coupled with the storing means for printing the hard copy of the at least one image. Molding the cover from a molten resin comprises causing a portion of the molten resin to contact a periphery of the window and allowing the portion of the molten resin to cool and thereby solidify so that the portion of the molten resin, upon solidifying, is molded over the periphery of the window and thereby seals and secures the window to the cover. A method utilizing the tool set allows a surgeon to percutaneously implant the rod in the patient.