well, that is an example of a tone that municipalities may use to say turn on an alert system or control waters or like control a dam or flood control systems. the idea of these systems is that they were pre-internet, they re radio broadcasts, so if there is a legitimate emergency they cannot be shut down. let s say all the power goes out and chances are you can broadcast the sound to these alarms and the reason you had 156 of them going on for 90 seconds each 15 different times nobody is sure exactly how it was pulled off but they didn t have to actually gain access to a computer. it seems like according to the smartest tech forensic minds i have spoken to it seems there was a combination of somebody having access to the codes, perhaps somebody in dallas having access to the physical boxes and somebody knowing the exact frequencies.