A miniature readhead for a photometric diagnostic instrument includes a housing of hand-held form factor, configured for receiving reagent sample media therein. This method further comprises receiving responses to these fractional information queries and comparing these responses to data available from within a computer network. One or more other mobile communications devices are located that are positioned, approximately, along the indicated direction of the gesture. The disclosed system may include a means for adding a power system to an existing LAN switch so that remote telephone handsets can receive power from a central location.