A networked computer with a networking framework that can operate in accordance with a standard protocol or may be configured to perform one or more functions that alter or extend processing according to the standard. The first sighting structure is positioned in front of the second sighting structure with the sight point of the second sighting structure being visible within the sighting aperture of the first sighting structure. Said retardation element is used in a three-dimensional display, and the like. Each of the light emitting cells comprises a first upper semiconductor layer, an active layer, and a second lower semiconductor layer.