Function: global-highlight-changes-mode

Toggle Highlight-Changes mode in all buffers.
With prefix ARG, enable Global-Highlight-Changes mode if ARG is positive;
otherwise, disable it. If called from Lisp, enable the mode if
ARG is omitted or nil.

Highlight-Changes mode is enabled in all buffers where
`highlight-changes-mode-turn-on' would do it.
See `highlight-changes-mode' for more information on Highlight-Changes mode. (fn &optional ARG)

Variable: global-highlight-changes-mode

Non-nil if Global-Highlight-Changes mode is enabled.
See the command `global-highlight-changes-mode' for a description of this minor mode.
Setting this variable directly does not take effect;
either customize it (see the info node `Easy Customization')
or call the function `global-highlight-changes-mode'.