Offline files synch'd to offline files

I am running Server 2003 at the office and XP Pro on the laptop.

I have been synchronizing the laptop and server using Offline Files.
No problem.

Now I've introduced a home PC running XP Pro.

How do I get setup so as to keep the same synch'd files on the
server,
laptop
and
the home PC??

I've tried to setup the PC to use Offline Files and synch with the
laptop. But the files on the laptop are also offline files. I haven't
figured out how to synch one set of offline files with another set of
offline files. It doesn't seem possible.

Any help please?