Complementary Technologies. A complementary technology is one that enhances or is enhanced by the technology being described, but for which neither is critical to the development or use of the other (if it were critical, then it would appear in the "Dependencies" section above). Typically, a complementary technology is one that in combination with this technology will achieve benefits or capabilities that are not obvious when the technologies are considered separately. For each complementary technology, this section provides a concise description of the conditions under which it is complementary and the additional benefits that are provided by the combination. If the complementary technology appears in the document, a cross-reference is provided.