Syncing without .Mac?

Question

Why is it necessary to have an internet connection to sync when Bluetooth is available on both machines?
I have this problem: Sensitive material on G5 and G4 - security a major concern. Sending info over the internet to sync two machines not an option.
I have no need for additional email addresses, web pages, web storage, photoalbums, etc. This is business.
Security is of course a concern no matter which route one chooses. Bluetooth carries its own risks, and even having two machines wired directly doesn't entirely solve the problem - modern sensor technologies can pick up signals from wires, peripherals (like monitors) over distances.
However, sending the information across the internet is certainly the least desirable option in my particular situation.
How can one sync two machines using bluetooth or, at least without having to use a network connection??
I'd be grateful for any help in this regard.
G4, G5   Mac OS X (10.4.6)  

Answer 1

I offered an answer to this issue in another thread where you had posed the question, not realizing that you had posted it separately here. So, for the record, here is what I said:
I was at one time a US Army Military Intelligence officer with an electronic warfare specialty, so I understand information security issues better than most people do. I was once assigned to the Alternate National Military Command Center, a short distance from Camp David. So, I will just assume that your concerns are well founded, but that building a TEMPEST-certified lead lined room is impractical! Okay, I'm just kidding about the lead lined room.
That said, while your specific concerns may be legitimate, for most users they clearly are not. Technology exists to provide secure links, and when the likelihood of selective targeting is considered, the chance that your information could be acquired and used in any manner by another party is almost nil.
Your best bet for unencrypted data transmission on your local area terrestrial ethernet network is to use MySync from Mild Mannered Industries:
http://www.mildmanneredindustries.com/mysync
That application offers high-speed local synchronization of each of the six data groups supported by .Mac Sync, without the need for a .Mac account and without the requirement, therefore, for transmission beyond your relatively secure, wired LAN. Such a channel is explicitly supported by the Sync Services framework, and is a far higher speed link—and inherently more secure—than a Bluetooth link.