I'm glad my post about my students needing Java-equipped computers got some responses.
Earlier I posted a simple question, asking whether PC's typically come with Java installed at the factory, and nobody answered. As a Mac user I've not kept up with this but somehow I had the impression that most PC's now do ship with Java. But err404 now says that 90% of Windows machines don't ship with Java. Ok, news to me, although I'd love to see some documentation of that.
In another response, 0815 seems to have gotten the impression that I'm teaching programming. Not true--at least, not in the course I'm referring to. I teach in the physics department of a public 4-year commuter school. The course that concerns me is introductory astronomy, which is taken by students with a very wide range of computer skills (and a very wide range of internet connection speeds). Many of our students use machines in the campus computer labs, but many others depend on home computers because their work and family schedules don't allow them to spend much time on campus. Of these, most are fully capable of installing something like Java. But a few aren't. My goal, in any case, is for them to spend more time studying astronomy and less time installing software.