I replied to your identical message in another group - if you need to post
to multiple groups, it's best to do so all at once in a single message
(separate the NG names with commas) so that everyone can follow the thread.
A lot of people subscribe to multiple groups, and this way you won't be
asking anyone to reproduce someone else's work, and everyone can benefit.
Crossposting = posting once to several newsgroups within a single message.
This is not a Bad Thing (presuming the list of groups posted to is small,
and all the groups are truly relevant to your question)
Multiposting = posting separate, identical posts to several newsgroups. This
is a Bad Thing.