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Lowell <lkirsh@cs.ubc.ca> writes:

> In my .emacs, I have the following line:
> (global-set-key [ C-/ ] 'hippie-expand)
> 
> But when I do C-h k C-/, it says that that key combo is bound to undo. 
> Why does my binding not stay?

Try

(global-set-key [(control /)] 'hippie-expand)

It should work in many versions of emacs.