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I don't know why the "document contains no data" occurs for
you, but I can explain what is supposed to be happening.
(Soon it will make
sense to write up some docs describing the internal workings
of HyperNews - it's still changing enough that it would
be partly a waste of time.)
The preview process writes a temp file, if you supply
any body text. The rest of the info such as title
and author is passed through
the preview page by being hidden in the submit form at the
top of the page. You can view the source of the page
to see it. The preview program (preview-response, which
uses preview-lib, which uses hnview) displays the response
as if it were already posted, but the body comes from
the temp file and the other info comes from the form data
passed to the preview-response script.
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Not sure 
Netscape Error: "Document Contains no data"
(Boris Kogan)
