In the mid-60s there was no messaging of any kind. For example, if you urgently wanted to locate a doctor who at that time was watching a movie in the cinema with his wife, the screening was interrupted and the doctor was notified in front of everyone. After this warning the screening resumed, the doctor went out and attended to his business. That changed when he makes his appearance… RADIO BEEP, as an electronic location and instant messaging mechanism, with a distribution of communications efficient enough for the message to be transmitted in real time.