Reading different things online and through his own imagination. Jeff had a single idea on what he wanted to do with the world. Living in the modern era was uninteresting to him. He really wanted to live in another time period. But he didn't want to travel through time....if he was changing the world...he wanted today to be like another time. And with the Chronovac, he could experience all of the times he'd imagined without leaving his own home, or his family.
Things would just change to match the time period he wanted to live in. It would be amazing. He started to key in the parameters. The world would revert to a simpler time, but no one living or dead would change.