Well, if you go into the command line on one of the Windows boxes, you type ping 192.168.1.67. If it comes back with a response, the Denon's talking (sort of).

Manually entering an IP on the denon, you would use something like 192.168.1.10, subnet mask 255.255.255.0, gateway 192.168.1.1. If you type ipconfig /all in the command line on one of the desktops, you'll find the DNS entries which you should use on the Denon.

I am the Doctor, and THIS... is my SPOON!