A Write Broadcast system and method uses a base station to write sent data
to all or some selected number (sub group) of tags in a base station
field simultaneously. By unselecting the tags that have been successfully
written to, and requesting a response from the remaining tags in the
field (or sub group), the system determines, by receiving a response to
the request, that there are tags in the field (sub group) that were
unsuccessfully written to. Another Write Broadcast signal is sent to
these tags. The system is useful for quickly (simultaneously) "stamping"
information on the tag memory of a large number of tags in the field of
the base station.