The quick start guide for AUCTeX says
As nearly everywhere in AUCTeX, you can use the TAB or SPC key to get a list of available level names, and to auto-complete what you started typing.
Which tantalizingly makes me thing AUCTeX has an auto-complete feature. But pressing TAB does nothing. I apologize for the simple question, but I've spent more time searching for it than I am ever likely to save so this is a last resort before I give up on it.
So, is there in fact an auto-complete feature in Emacs AUCTeX? How does one turn it on if so?
Edit: I just figured out
M-TAB is problematic since it is bound to a OS GUI action. I saw a website discuss this problem and it notes that there are two key bindings which are supposed to be equivalent:
c-[ c-I and
ESC TAB. Except these for some reason give me dictionary spelling corrections for the word I wrote which is not exactly what I was expecting.