Re: Modifier Keys and the Archaic Meta Key

[Francis Belliveau <f.belliveau@comcast.net>]

> On Oct 25, 2020, at 08:49, Christopher Dimech <dimech@gmx.com> wrote:
> 
> 
> Not instantly, that is agreed. But we can start with adding
> the Key-Mnemonics 'A' and 'P'. We can call the key with Priority
> 2, the Alternate Key 'A'.
> 
> So nomenclature will be, by priority and Mnemonics:
> 
> Control (C), Alternate (A,M), Hyper(H), Shift(S), Super(P,s).

It seems that I have been left in the dark somewhere along the line.  I do not understand the concept of "priorities" in this context.
I have been using Emacs since the 1980's.
As I see it there are three modifier keys: Shift,Control and what Emacs calls Meta.  In general, Shift does not have meaning since it only changes the character that the other modifiers apply to (C-a versus C-A or C-, versus C-<).
I have always understood that what the Emacs documentation referred to as "the Meta Key" as the other modifier key used by the current OS or setup.
As I understand things the modifier keys apply, period.  C-M-a has no relationship to either C-a or M-a so where does priority come into play here?

Fran