You can either use an IMAP or POP account to access a second server or two
different profiles.

Hi -

I replied 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.  :-)

See  http://www.aspfaq.com/etiquette.asp?id=5003 and
http://www.blakjak.demon.co.uk/mul_crss.htm