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From: John Paul Wallington <jpw@gnu.org>
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Subject: Re: Item for TODO?
Date: Fri, 21 Jan 2005 16:42:42 +0000
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> There's also been discussions to add support for tooltips, tho it's
> not clear exactly what this should look like, but it could begin
> with a command to "show tooltip at point" which could be added to
> the C-h map.

We have that:

C-h . runs the command display-local-help
   which is an interactive compiled Lisp function in `help-at-pt'.
[...]
Display local help in the echo area.
This displays a short help message, namely the string produced by
the `kbd-help' property at point.  If `kbd-help' does not produce
a string, but the `help-echo' property does, then that string is
printed instead.