A liquid ejection apparatus includes: a liquid ejection head; a conveying mechanism; a holding mechanism for holding at least one recording medium between its first and second surfaces; a moving mechanism for moving the first surface; a reception tray disposed under the holding mechanism; and a controller. A multidimensional clustered table is one whose data is simultaneously clustered along one or more independent dimensions, or clustering keys, and physically organized into blocks or pages on disk. A power change detection apparatus may also be configured through the user input method to operate different groups of wireless lighting modules such that lighting zones may be created. A client request directed to the cluster IP address is received in the node.