It is called to display information stored in the help-echo property
of strings. For example moving the mouse pointer over the mode-line,
menu entries or some buttons, buffer lines in grep-mode. Normaly
show_help_echo delegates all work to show-help-function. This
mechanism is used to popup tooltips. When show-help-function is nil
(like on text only displays or when tooltip-mode is disabled)
show_help_echo does the job itself by displaying those strings in the
echo-area.
Could someone please clarify the comment based on this?
The existing comment was not written with a view to making
it clear to people who don't already know.
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