Entering IDLE in 2.2.2 on Win2K:
    >>> help()
    help> topics
Lists (among many others), UNICODE.  Howver,
    help> UNICODE
elicits the error:
    could not read docs 
    from C:\PYTHON22\doc/ref/unicode.html

It seemed the only entry in topics that did fail,
but I am not certain this is so.

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I've looked into this briefly, and it looks like this is
caused by the pydoc module (which implements the interactive
help facility) having a static mapping of topic names to
HTML files.  Since this list is static in the code, and not
generated from the documentation in any way, it's out of
date.  That section (which was available for Python 2.1.x)
was never filled in with anything more than "XXX explain
more here...".

It's not at all clear what documentation this should point
to; I suspect it's material that still needs to be written.
 I'll open a separate bug on the matter that the list of
topics is not integrated with the documentation maintenance
-- it should be so we're more aware of this mapping and
don't break it accidentally.

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This was fixed recently by change for bug #642168.