On Wed, 08 Jun 2011 00:57:21 +0800, Man-wai Chang wrote:

CHDK functions are not _supposed_ to be "permanently added into the Canon firmware".
The Canon firmware is completly unaltered--CHDK runs on top of it and
must be loaded from a memory card every time the camera is booted.

Very much like regedit in Window$...

But not as potentially dangerous.