How do you code looking at two files at one time? What's the point? I've been programming for nearly thirty years now. For the bulk of that time, I had an ed

How do you code looking at two files at one time? What's the point? I've been programming for nearly thirty years now. For the bulk of that time, I had an editor which allowed me to do split screens, and I used it maybe once a year. I switched to TextMate in 2008, and have never once missed having a split screen.