A wheelchair having an adjustable seat includes a seat frame including first and second side support members. Whether there are more than N apparatuses using APIPA is checked based on the replies, and if there are, IP address setting by APIPA is executed. The moveable sensor headbrew allows beverage brewing devices to use servers of various heights. The remote management apparatus performs remote management of the condition of the processor on the basis of the transmitted operation log. In one embodiment, a tablet computer case may include a first panel configured to releasably engage and hold a tablet computer of a predetermined size and shape, a second panel having a keyboard a hinge rotatably attaching the two panels, and a communication connector that allows the keyboard to communicate with the tablet computer. The write clock is independent of the read clock.