Re: How to unset a prefix key locally?

[B. T. Raven]

vmlinz unconscious wrote:
> Hello,
>
> I'm using emacs23.0.91 packaged by debian, the simple.el defined a key
> sequence "C(upercase letter 'c'） - m" and the prefix 'C'(upercase letter
> 'c') prevent me from typing letter 'C'.
>
> I tried to unset the key binding "C - m" locally ,but the prefix is still
> there . I looked up functions in elisp manual but there is no function to
> unset a prefix key.
>
> Now I have to stop simple.el from loading or to change the debian load
> settings of simple.el to comment out the key settings.
>
> So how can I locally unset a prefix key?
>
>
> Thx

[Changed encoding from Japanese so I could type \ key]

At least in ver. 22.3 all references are to \C-m not to C-m. In what 
context can you not type uppercase c?
Is there any place in Emacs where ordinary letter  key is a prefix?