A coming and going personnel control system having a high security level by prohibiting a coming person who has dealt with a dangerous substance from entering a facility through a control area is disclosed. The preferred architecture consists of a Digital Signal Processor with on-chip Random Access Memory. Selecting images contained in the image selection module generates a reference pointer corresponding to coordinates in the reference pointer of the control module which thereby generates a rotor sequence that is passed to the password generator module containing ASCII characters groups. The nanowire structures and the networks formed using them are useful in catalyst and electrode applications, including fuel cells, as well as field emission devices, support substrates and chromatographic applications.