Meaning of Console_ entries in keymap files

I think the man page for keymap is pretty awful, but I have managed to figure out most of what I'd like to know. Some things are throwing me though. For example, just looking at F10:

keycode 68 = F10 F22 Console22 F34

alt keycode 68 = Console10 control alt keycode 68 = Console10

I understand that F22 is the shifted F10 and I can program that easily.

I can also program F34 easily, though it isn't what I think it should be from "man keymaps". If I program F34, it's Ctrl-F10 that will send my definition, not shift AltGr as I would have thought from

modifier weight Shift 1 AltGr 2 Control 4 Alt 8

etc.

The F34 is in position 3, not 4, so that should be Shift and AltGr, not Control. The man page says that Shift and Alt would be from position 9, or tenth column, so I can't be reading this wrong..Control should be position 4 or column 5.. yet I must be wrong. So that's confusing..

I can even program the the mysterious Console22 position if I replace the keymap with something like:

keycode 68 = F10 F22 F100 F34

alt keycode 68 = Console10 control alt keycode 68 = Console10

and then if I program F100, either Alt key sends my definition.

So, I guess a few questions:

Why am I misunderstanding the modifier table?

What is the meaning of AltGr as opposed to just Alt in the modifier table?

What do these "Console" keysyms indicate? I've grepped through all the source and the include files, and the only place I find these is in keymaps.. so it must be loadkeys that translates those.. into what?

-- Tony Lawrence