I can't test that program at the moment, and from that thread it appears something is wrong. But from what I gleened from that, it is not what I really want. But it does answer my question.
That program appears to copy whole INI files from character to character. And since the hotkeys are stored in the INI file for each character, I don't want to copy the whole thing. Just certain sections.
Should not be hard to cut and paste from one to the other manually now that I know which file to look at.