Used for local communication between programs running on the same computer.

However, by 1940, the technology was no longer used for communication.

But we can't see any way that they could have used sound for communication.

Why had no one used the same sort of system for communications on Earth?

It was used for military and national communications until the 1850s.

This can create an opportunity for communication between players within the rules of the game.

It also gave him the effective media for political communication.

A 21st century model for communication in the global war of ideas.

That's also why a lot of people turn to the Internet for social communication.

We don't talk any more Do on social networks make for better communication?