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(emacs)Tooltips

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Tooltips (or "Balloon Help")
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   Tooltips are small X windows displaying a help string at the current
mouse position, typically over text--including the mode line--which can
be activated with the mouse or other keys.  (This facility is sometimes
known as "balloon help".)  Help text may be available for menu items
too.

   To use tooltips, enable Tooltip mode with the command `M-x
tooltip-mode'.  The customization group `tooltip' controls various
aspects of how tooltips work.  When Tooltip mode is disabled, the help
text is displayed in the echo area instead.

   As of Emacs 21.1, tooltips are not supported on MS-Windows.  So help
text always appears in the echo area.