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11.10 Help on Active Text and Tooltips
When a region of text is “active,” so that you can select it with the mouse or a key like RET, it often has associated help text. For instance, most parts of the mode line have help text. On graphical displays, the help text is displayed as a “tooltip” (sometimes known as “balloon help”), when you move the mouse over the active text. See section Tooltips. On some systems, it is shown in the echo area. On text-only terminals, if Emacs cannot follow the mouse, it cannot show the help text on mouse-over.
You can also access text region help info using the keyboard. The
command C-h . (display-local-help
) displays any help text
associated with the text at point, using the echo area. If you want
help text to be displayed automatically whenever it is available at
point, set the variable help-at-pt-display-when-idle
to
t
.