I'm using Aquamacs 2.x in MacOS X 10.6. (I'm using the Command key as M and the Ctrl key as C.)
WHen I try to use keybindings containing "@", it does not work, e. g.
C-c @ C-t in
I can type the @ sign in Aquamacs buffers with Alt-L.
But when I try to hit Ctrl-C, Alt-L, I get the message "^C ⌘L is undefined" even before I can add Ctrl-t
EDIT: it seems that I can use the Alt key and the Command key as well as META-Key, which is not necessary. I only want to use the Command key as META (to be "compatible" with WIndows and UNIX computers).