Indirect Storage (STO IND) ELI5 what and why?

[DM48]

Eddie, thank you for the explanation. I'm still not quite grasping it, but I suspect that is because I am mixing up "register" terminology. X, Y, Z, T, A, L registers vs a memory register.

My first real calculator was a TI-85 and then an HP48GX when I saw it in 1994. I came in after the 42s and am slow on the pickup of a new language.

I will study your example and post back with questions.