Offline synchronization of shared subset of two different repositories?

[Kerry L. Bonin]

Hello!  I've gone through the archives and googled this one, couldn't find 
exactly what I was looking for...

I use CVS at work and home.  I have shared a subset of my home based 
libraries with work, but changes are now being checked in to my libraries 
at work (mostly, but not exclusively by me.)  Further, neither the work or 
home CVS server are open to the Internet.

Is there any non-manual method to apply changes between sites, including 
histories?  Such as some way to grab some sort of diff that I could hand 
carry between sites occasionally?

I've also been given permission to move some of our work libraries into 
open source, but I'll run into that same problem there synchronizing 
changes between private CVS at work and open CVS somewhere like sourceforge.

Many thanks...