I have a hard time believing that your network can't support:
routers
firwalls
print servers
macs
*nix
or any other system/device that speaks regular DNS over UDP 53.
If your network is really that borked then I'm not sure its worth
considering as a mainstream dependancy. It sounds like you guys have
chosen to effectively disable DNS, which means that we're talking about
site-specific architecture issues.
--
Eric A. Hall http://www.ehsco.com/
Internet Core Protocols http://www.oreilly.com/catalog/coreprot/