An electronic control unit of an engine system starts a control that supplies heat reserving hot water stored in a heat accumulating device to an engine prior to an engine start. One inlet port allows for the introduction of a test sample. The shutter blade includes a light shielding portion capable of moving across the aperture by rotating about a shaft formed on the base, a securing portion secured on the base, and an elastic portion connecting the light shielding portion and the securing portion. After determining transfer qualities for the various content sources, the requester provides the transfer qualities to a selector on the content distribution system. The differential engine can advantageously leverage memory pages of the proxy server to compare differences between signatures of blocks of the last full backup with signatures of new blocks.