The invention provides an apparatus for storage and retrieval, at a grave site, of genealogical information. Each of the first to fourth memory cells comprises a cell transistor having a gate connected to a word line extending in a second direction crossing the first direction and a resistive memory element having one end connected to a first sourcedrain region of the cell transistor. The detector generates analog detector output signals indicative of the location of the optical pattern on the detector in an alignment direction orthogonal to the X direction. If previously acquired security data associated with the media peripheral is found, an identifier associated with the home may be acquired, authenticated, registered andor distributed throughout the communication network.