This was billed, at the time, as a philosophical statement of sorts: Apple wanted to make the personal computer into an appliance, like a toaster. But it also reflected the purely technical demands of running a graphical user interface. In a GUI machine, the chips that draw things on the screen have to be integrated with the computer's central processing unit, or CPU, to a far greater extent than is the case with command-line interfaces, which until recently didn't even know that they weren't just talking to teletypes.

This distinction was of a technical and abstract nature, but it became clearer when the machine crashed (it is commonly the case with technologies that you can get the best insight about how they work by watching them fail). When everything went to hell and the CPU began spewing out random bits, the result, on a CLI machine, was lines and lines of perfectly formed but random characters on the screen--known to cognoscenti as "going Cyrillic." But to the MacOS, the screen was not a teletype, but a place to put graphics; the image on the screen was a bitmap, a literal rendering of the contents of a particular portion of the computer's memory. When the computer crashed and wrote gibberish into the bitmap, the result was something that looked vaguely like static on a broken television set--a "snow crash."

And even after the introduction of Windows, the underlying differences endured; when a Windows machine got into trouble, the old command-line interface would fall down over the GUI like an asbestos fire curtain sealing off the proscenium of a burning opera. When a Macintosh got into trouble it presented you with a cartoon of a bomb, which was funny the first time you saw it.

And these were by no means superficial differences. The reversion of Windows to a CLI when it was in distress proved to Mac partisans that Windows was nothing more than a cheap facade, like a garish afghan flung over a rotted-out sofa. They were disturbed and annoyed by the sense that lurking underneath Windows' ostensibly user-friendly interface was--literally--a subtext.