Abstract: An object of this invention is to provide a system to properly charge a receiving fee for a particular packet data to a sender of the particular packet data in circumstances in which the packet charging is performed. A mailing request receipt processor 110 registers information regarding a destination user, a sender and a particular packet data to be sent in a storage device 120 for storing a mailing request for advertising. When a terminal of the destination user registered in the storage device 120 conducts a process to receive packet data, a packet switch 5 charges the destination user for the packet data. A charge transfer processor 150 transfers the fee charged to the destination user for the particular packet data, to the sender registered in the storage device 120, by using a receiving status data for the particular packet data by the terminal 9 of the destination user, which is registered in the storage device 120.

Abstract: A method for sheet forming a remarkably waterproof gypsum hardened body, in which a main component consisting of gypsum dihydrate, slag and calcium hydroxide and additives are added with a part of the main component coated with a hydrophobic diorganopolysiloxane fluid having a kinetic viscosity of 10-10,000 CS at 25.degree. to be sheet formed and cured. The hydrophobic diorganopolysiloxane fluid is uniformly dispersed through the sheet formed gypsum hardened body and its strong water repelling property makes the gypsum hardened body remarkably waterproof to be used suitably as both interior and outdoor construction materials.