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From: martin rudalics <rudalics@gmx.at>
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Subject: Re: Can one define global-set-key to override mode-based keymap?
Date: Thu, 21 Dec 2006 14:17:39 +0100
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 >> Not really recommended:
 >>
 >> (defvar my-map (make-sparse-keymap)
 >>    "My keymap.")
 >>
 >> (defvar my-map-alist `((t . ,my-map))
 >>    "My keymap alist.")
 >>
 >> (add-to-ordered-list 'emulation-mode-map-alists 'my-map-alist 100)
 >>
 >> (define-key my-map [(control n)] 'other-window)
 >
 > I tried this and it works great so far. Why is it not recommended?

It might interact badly with other modes using this - like cua-mode.
If you use them, you should study their keymaps in order to avoid any
bad interactions.  Alternatively you could try `overriding-local-map'.