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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Improved help from minibuffer prompts
Date: Wed, 14 Apr 2004 18:53:44 -0400
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    Here's an idea:  Use the normal binding for `describe-function' (`C-h f',
    or `F1 f') and either have it directly pop up the help for the currently
    executing command (i.e., don't prompt for a function name as usual), or
    else prompt as usual, but set the default value for the prompt to the
    function currently executing command (so that you'd typically use `C-h f
    RET' to get help in the situation you describe).

Only experienced users will think of doing this.
It is not adequate for the job, which is to help novices.
It would not occur to a novice to type C-h f in the minibuffer
to get help about the command that invoked it.