The dialkyl peroxydicarbonates with short alkyl chains, preferably diethyl and diisopropyl peroxydicarbonates, are used for the aqueous suspension polymerization of vinyl chloride, in the form of a solution in a dialkyl alkanedicarboxylate which is liquid and insoluble in water. A particularly compact configuration is obtained by disposing the transmission in the space between the cylinders. A second light source acts directly on living biological entities to sterilize or kill them and thereby disinfect the fluid, and can also serve to activate a semiconductor photocatalyst that in turn causes further damage to biological contaminants. Upon receipt of a data stream demand from the Client, the system identifies the required data source and at the same time it sets up a secured transfer channel together with performing data stream distribution process optimizing. In one embodiment, the one or more floor stringers may be disposed on stringer support spacer beams positioned on one or more of the cross bearers. In some embodiments Session Controllers andor Internet Attachment Points are identified with such addresses.