Can't rebind key C-z in xemacs - xemacs

Question

For some reason, "C-z" is mapped to suspend-or-iconify-emacs and I can't seem to get it to rebind to something less annoying. (I like using ctrl-z for undo, but doing nothing would at least be better than suspending every time I accidentally hit the key)
I've tried doing it interactively:
M-x global-set-key, then Set key C-z to command: undo.
M-x describe-key-briefly gives me C-z runs the command suspend-or-iconify-emacs
I've tried going to the scratch buffer and evaluating:
(global-set-key (kbd "C-z") 'undo) and (global-set-key "\C-z" 'undo), and it is of course in my .xemacs/init.el file.
Nothing seems to actually rebind the key.
This is happening on XEmacs 21.5, in Fundamental mode. Any ideas on how to troubleshoot this?
edit: Ok here is a hack that gets around the problem by redefining the suspend function to undo:
(defun suspend-or-iconify-emacs () (interactive) (undo))
I can't actually suspend emacs anymore, but that's actually ok with me.

Answer 1

Try evaluating this:
(define-key global-window-system-map [(control z)] 'undo)
(assuming that you aren't running XEmacs in tty-mode, but I guess you are not, if you want to iconify :-))
I used C-h b to find out what *-map to modify.

Answer 2

I have the following code in my .emacs:
(global-set-key (kbd "C-z") 'eshell)
It will start an eshell, and it works.
The C-z combination is pretty standard on Unix/Linux, if you're working in a terminal with e.g. vi, lynx or mutt and presses C-z the program will suspend and you will be back in the shell. Issuing the 'fg' command will pop the program back again. As Emacs has its own shell, I like spawning that when pressing C-z in Emacs.
You can also add the following hook, that will remap C-z in the eshell. That way pressing C-z in the eshell with get you back to the buffer you were editing.
(add-hook 'eshell-mode-hook
(lambda ()
(local-set-key (kbd "C-z") 'bury-buffer)))

Answer 3

Put that at the end of your .xemacs/init.el :
(global-set-key (kbd "C-z") 'undo)
Or maybe you have a misconfigured keyboard or operating system.
Do C-h k C-z to see if xemacs really receives a C-z key.

Answer 4

I had the same problem with C-f. I wanted it to map to isearch-forward, but instead it kept moving one character forward.
I finally solved my problem by adding
(global-unset-key [?\C-f])
(global-set-key [?\C-f] 'isearch-forward)
Apparently the issue is that C-f (and C-z) is a "real" key, that is, it's something that a terminal recognizes (it's ASCII 0x06, 0x1a for C-z), so you need the "?\" in front of "C-f".
This is the only thing I got to work.
HTH
(EDIT: I should note that I use emacs, not xemacs)