What does the shading around some 48 series keys indicate?

[Orome]

(04-18-2020 07:10 PM)acoto Wrote:  I suspect was there to show "Advanced" applications on the HP 48G

It looks like that was the intent. The highlights do sort of correspond to "applications" in something like the sense of a feature package, while others are closer to generic calculator features.

(04-18-2020 07:10 PM)acoto Wrote:  I never liked much that shadowing.

Nor have I, but now that I see the (likely) intent, I'm less baffled by it, at least.