As I recall, the buttons looked like just ordinary text links in a coloured table, presumably with javascript callbacks for the clicks. So I suppose they'd have

As I recall, the buttons looked like just ordinary text links in a coloured table, presumably with javascript callbacks for the clicks. So I suppose they'd have been screen reader-friendly enough for use by the blind and so on, while still being random enough by default to defeat mouseloggers, and keyboardless enough by default to defeat keyloggers.