Red `*' in *info* menus?

[J Krugman <jkrugman345@yahbitoo.com>]

In the menus that come up when I do "C-h i", each available choice
(subtopic) starts with an asterisk.  Most of these asterisks are
rendered in the usual foreground color, but a few of them are
rendered in red.  What do the red asterisks mean?

And, more importantly, how could I have answered this question for
myself using the online info system?  I searched for "[^a-z]red[^a-z]"
the "* Info:  (emacs-21/info)" subtree but nothing came up.

Thanks!

jill


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