That's the easiest way, but you may need some way to synchronise the
details of the article numbers you've read, depending on the news server
Otherwise, it can be done, but it depends on your newsreader how you do
it. Generally, it involves copying files from one computer to the other,
or using a portable version on a thumb drive.
That's the easy way if they're all on the same network, and I've even
done it across a combined Windows/ Linux network. It could be a problem
if the OP wants to have a number of computers all accessing news at the
same time, all updating the same ~/.newsrc file, though.
I can and do access Usenet from anywhere, including my phone, by SSHing into
a Linux box and running tin inside a tmux (or GNU screen) terminal session.
Accessing at the same time is no problem - the display and cursor are
synchronised between machines.
Obviously this is a terminal program, so it's keyboard rather than mouse
driven (it's usable but not great on a touchscreen phone, for example). But
it works and it's bomb-proof - SSH is available on almost all platforms, and
it's also very low bandwidth (but not great with high latency networks).
A GUI version of the same would be to run a normal Windows/X/whatever
newsreader in a VNC session.
Not really IMAP-style, though.
I do it with thunderbird on several machines. The profile folder on a
shared drive on the NAS. There is a limitation that you can only have
one client running at a time though. That can be on the lan or via a VPN
if I really wanted.
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