| 摘要 |
A system that uses computer driven visual displays in area-defined public places to communicate public alerts to people in those places using large publicly viewable computer driven visual displays and/or computer driven visual displays in the form of hand held mobile telephones, personal digital assistants, and laptop computers. All of these displays can be connected via computer networks, using wireless networks for the mobile devices. With the invented system, public alert messages that are relevant to a locality are distributed via computer networks to computer driven image displays within that locality. They are displayed on all displays, all at once.
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