A boiler control system for efficiently controlling the operation of a packaged boiler is provided. A stepped top portion is received into an upper bore of a piston bore and a shoulder is received into a lower bore. On the other hand, the electronic mail transmitted from many and unspecified persons and not to be rejected by the reception enable unit is transmitted to a second electronic mail address. As a result of checking, if the folder to be displayed in the list is a search folder, the apparatus displays search conditions in fields of meta data items for which the search conditions of the search folder are set, in place of, for example, meta data. Transitional times between at least three of the OFF mode, the ON mode, and the energy-saving modes can be set as desired. The server can also concatenate matches associated with data received from a plurality of computing devices and provide the concatenated data to a third party, who in turn, returns services to the users based on the received data.