If the device has an IP, which it will need, then yes. I guess it would have to respond to pings, but what would be the point in having a network connected device that didn't let other devices 'talk' to it!
I haven't got a Windows PC up and running at the moment so can't test this, but I used to use a program called WS Ping Pro on windows. That detected my TV, phones, Slingbox, Wii and all PCs.
On linux you can use 'nmap -sP 192.168.1.0/24' to scan everything on 192.168.1.*
Edited by beardedwonder (Sat 10-Nov-12 14:13:47)