Forbes, September 2003 Now Hear This
"Marketers have always dreamed of whispering into the ears of individual shoppers as they mill around the aisles and inch along checkout lanes.
"An HSS emitter can put a message to a single person standing in a crowd 200 feet away, without anyone on either side able to hear it. Motion-sensitive HSS emitters can flog Doritos on one end of the snack aisle and hawk Cracker Jack on the other."