Rich:
Your fax PC would be a perfect candidate, but it would need the following:
1) An externally addressable IP
2) A Notes client
You install the Cadenza service on THAT PC (not yours), and install the mNotes client on your Tungsten (I'm jealous - the W is a beautiful device!). Point your Tungsten at that PC.
End of instructions.
After that, configure users just as you would for standalone.
Incidentally, the Commontime support people are wonderful, but remember they're in England, so if you're in the US get them in the morning!
- Rob
http://www.dominounplugged.com
PS: Check their site for the Admin guide ... that will be the greatest help to you.