I wonder what is with the netscaproups, that still seem to be active?
They do overlap:

news://news.mozilla.org:119/mozilla.dev.tech.xul
news://news.mozilla.org:119/netscape.public.dev.xul

news://news.mozilla.org:119/mozilla.dev.tech.xml
news://news.mozilla.org:119/netscape.public.mozilla.xml

etc.

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Bye,
Andreas M.