Is it possible to use PeerFinder for initiating connection between applications in different PCs inside intranet?

I tried ProximityCS (Windows 8.1) sample and PeerFinder.SupportedDiscoveryTypes returns None for me. (Tested with Windows 8.1 Preview)

I have only found samples to connect using NFC or WifiDirect.
Is there any samples of using Infrastructure (TCP/IP) way of connecting?

Is it possible do this manually using Broadcast messages from Windows Store app?