Hoooyaaa!
He boasted in ignorance, and now he's Roasted and Toasted!
Semper Fi!
Computers are used for more than just presenting screens. They were here long before that use surfaced. I work in the industry that makes electronic gizmos, like cell phones, set-top boxes for cable TV, medical instrumentation, and so on. These are not web-page applications, but hard core engineering: electronics, math, physics, chemistry. This type of software is very different than what you perception of software seems to be.