Network Protocol Documentation for ARD or ANA?

Is anyone aware of any documentation on the network protocols used by ARD? I have plenty of docs on RFB/VNC, but Apple is doing something more with ARD than standard RFB. It looks like they are still making some use of Apple Network Assistant (UDP port 3283) protocol and clearly performing other tasks that aren't part of the RFB standards. Could anyone point to any documentation for this?
I'm trying to develop some utilities that will make working with ARD in a multi-thousand Mac environment a bit more tolerable. I'm not very interested in remote desktop control; this is about asset management and patch management. Once you have more than a couple-thousand Macs in ARD, it seems to slow to a crawl.
For example, we have a very large number of large (21-bit) subnets, and the ARD scanner takes forever to scan them. I've written a small utility that will scan a subnet in seconds, and provide a text file containing only active computers that are Macs. This output loads into ARD much, much faster. I did this after discovering that a UDP packet sent to port 3283 will cause a Mac to respond with its name, ethernet address, etc. I'm trying to figure out what else is in that response packet, and what more I can do. I'd rather have an ARD API that allows me to add/remove computers into ARD (anyone?) but that appears to be the one area that Apple forgot. I'm still new to the Mac world, so I could have missed any number of things. Pointers would be welcome.
Thanks!

Ok, I've figured out why I dropped the AppleScript route. The ARD dictionary command to "add" a computer to a list appears to require a computer descriptor for a machine that is already in ARD. So, doesn't look like it can actually add a computer to ARD via that route.
Regarding import from file:
I've used the scanner to scan IP addresses from a text file that is the output from my utility. While manual, this does work. I then have to "add" the computers to the "All Computer" list manually, specifying the credentials. This has been my process to date. Better than nothing, but very manually intensive. It also appears that the scanner is limited to scanning only the first 4096 addresses from a text file, we have about 20x that number of Macs.
I have not tried writing a plist from my utility and importing directly (bypassing the scanner). I'll give that a shot. Assuming this works, it might take one manual step out of the process. Still not sure if I can automate list import any further.
I'd still like to find some protocol-level documentation so that I can improve the precision of my scanner utility. I'd like to verify my credentials on each system discovered, and verify that the ARD client-upgrade is an authorized task before going to the trouble of adding them into ARD only to find these problems later. So far, a significant percentage of my Macs are still running ARD 2.x and 1.x so the upgrade process is important. On a related note, it doesn't look like the "Upgrade Client" task can be relegated to the local task server. Wonder why...
Thanks again.

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