A compound optical unit includes a housing mounted on an optical pickup apparatus, the housing has a semiconductor laser device, a light receiving device, and a compound optical device, fixed to the housing. In another embodiment, the composition comprises MU and a catalyst or initiator capable of inducing a combining reaction of the metal-containing precursor units. A transmission process transmits the feature information to a remote computer at a known address using a self-describing computer language. The method of the language-dependent API is a method to obtain data from the collaboration server component. In order to obtain a reduction in the contamination of an optical illumination system as well as an instantaneous optimization of the power of a radiation source, at least a quantity of the material is controlled by a blocking device.