Software that lasts a 200 Years

Dan Bricklin has inked his thoughts on a topic, "Software that lasts 200 Years" that should interest all of us in iT, for one i am curious, as in todays day and age software doesnt seem to last more than 3 years in its current state, so i wonder what a software that lasts 200 years would be like, i am just begining to read the essay in detail will post my critique once done,