A file transfer application maintains a secure connection over the Internet with a file transfer gateway. A holographic demultiplexor includes a volume hologram having holograms for redirecting the constituent light signals. A camera motor directs the night vision camera. A sensor array may be disposed about the screen, and sensing electronics are provided to determine the location of user input on the screen by sensing localized deviations in the amplitude of the sensing signal. The conductivity of the dielectric layer is lower than the conductivity of the first electrode or the second electrode.