A commerce system has a virtual marketplace. Multiple operating systems, each of which may be of a different type or nature, run on different partitions of the multi-processor platform, yet coexist and cooperate. The objective forms a real intermediate image of the retina between the objective and the camera unit. The web materials can be formed into a variety of shapes and forms suitable for use as implantable medical devices or components thereof. In another configuration, a blow-off valve is used to introduce positive air pressure to timely release the suction cup.