A control device executes toner concentration control that controls an operation of a developing device such that a value of detection output detected by a concentration detecting device falls within a predetermined range. A first FIFO control module generates and assigns a first random sequence to the memory blocks and stores first data in the memory blocks according to the first random sequence. This result is preferably achieved starting from a reference set of cells by locating: \u2014i) areas of superposition between adjacent cells covered jointly by traffic capacity of adjacent cells in the reference set of cells, and\u2014ii) uncovered areas between adjacent cells, that is, areas not covered by traffic capacity of any cells in the reference set of cells. Remote users may perform operations such as updating an existing message, posting a new message, download messages, and the like. Some plate assemblies include a second substantially planar member having a third side, a fourth side, a third opening, and a fourth opening. The improvement being the inclusion of between about 3% and about 20% propellant superfines, the superfines comprising particles less than 100 \u03bcm.