When activities are operated in parallel, and there is only one status display, an ordered list is implemented with three methods of access: insertion at the top, removal from anywhere, and read of the top item. In one aspect, a set of computer-readable media provides a method that includes receiving a request from a mobile device for data and transmitting the data across a coaxial cable to a cable modem. Because a driving voltage of the electrochromic solution is low, the thickness of an intrinsic layer in each of the thin-film solar cells can be thinned, which increases the transmittance of the photovoltaic electrochromic device.