What does the shading around some 48 series keys indicate?

[franz.b]

(05-01-2020 06:57 PM)Jake Schwartz Wrote:  Indeed, at the 1994 Dutch HP conference, HP's Diana Byrne (HP48G-series software team leader) talked about the internal "keyboard wars" before releasing the 48GX. I believe that Bill Wickes used the same term when presenting the 48SX, three years earlier.

Jake

Has there been a global thermonuclear war for the 50g keyboard?
...already lost since 49g ...