They're hard to distinguish. The problem is what the automobile designers call head-down time. There's a lot of head-down time in this beautiful car, to set the temperature right. And if you want to make the speakers in the back louder than the speakers in the front, you have to go through a hierarchical drill-down menu of buttons. It is absolutely not safe to do that when the car is moving.
People do it now with cell phones.
The safety issue is here, now, because computers are everywhere in our lives, and what's happening is they're really hard to use. It's been 10 years since you handed Microsoft the backbone of the Visual Basic product. You have to understand that I never worked for Microsoft. I was an outside guy, and I invented a product and sold it to Microsoft, and it was a visual programming language for end-users. But I saw it very much as a thing for consumers, for people who wanted to get productive work done, not for people who wanted to build tools for other people to get productive work done.