Today we can be in constant electronic touch with our friends, if we want to be. We update our Facebook pages with the latest news of our lives. If that's not fast enough, we can "tweet" about how we're stuck on a broken-down subway from our smartphones. Finding a used saxophone is as easy as a few clicks on Craigslist. It wasn't always like this, of course. But how did it get started?
This is an historical article about computer systems that used to connect to each other via telephone.