Each packet would begin at some specified source node, and end at some other specified destination node.
The invention of the mailing list followed naturally.
This was an ARPANET broadcasting technique in which an identical message could be sent automatically to large numbers of network subscribers.
ARPANET’s users had warped the computer-sharing network into a dedicated, high-speed, federally subsidized electronic postal service.
The main traffic was not long-distance computing, but news and personal messages.
As the ‘70 advanced, other entire networks fell into the digital embrace of this ever-growing web of computers.