An RF tag system, comprising an RF reader configured to issue a plurality of
different
RF commands and to provide a continuous RF illumination field, and a plurality
of RF tags respectively including a permanent identification; wherein the plurality
of RF tags are configured to respond to a certain RF command from the RF reader
by transmitting their respective identifications by way of backscatter modulation
of the RF illumination field, and wherein the RF tags are further configured to
perform the responding by way of respective independently selected random radio
frequencies and timeslots from respective pre-defined ranges of radio frequencies
and timeslots.