Video send and receive capabilities of participants are determined by the respective machines determining available combinations, as well as preferences for the receivers. A hub is rotatably attached to the housing within the cavity. Also provided is structure in the holding furnace for separating inclusions from the melt in the holding furnace. Positioned within the holder is an actinometric monitoring element that can be either a transparent container for an actinometric solution or a photocell, each for sensing the irradiance of ultraviolet light emitted by light sources positioned within the vessel or pipeline. The apparatus and systems employed in forming the coated particles utilize vibrating bed coaters, vibrating conveyor coaters, or coating towers. A porous core is positioned within the recess of the base, and has a core coolant inlet opening and a core coolant outlet opening that are arranged in corresponding relation with base coolant inlet opening and a base coolant outlet opening so as to be in fluid communication.