There is one specification for Midi over network called RTP-MIDI, which is a standard and described in more detail in the Midi Association website:
(This scientific paper presented at the 2004 American Engineering Society conference explains the protocol in deep detail. Those interested should also read the final specification – RFC 6295.)
It was developed at UC Berkeley and is fully implemented in Apple’s Core Audio engine but with little adoption elsewhere. It allows MIDI information to be exchanged via wired or wireless networks.
That being said, implementing that in the MOD device would most likely require another microprocessor and/or a major tweak in the OS, so it might not be worth it. MOD already offers 5-pin or Midi A outputs and accepts MIDI in via USB, so it’s a lot of work for relatively little gain (in my non-savvy opinion.)
Also, anything wireless – be cordless phone at home, a TV remote control, a super expensive Sennheiser wireless Microphone, etc etc etc – brings with it the utter nightmare of getting approvals by various Communications commission around the world. (The FCC in the US delayed Fishman’s Triple Play by almost a year with their endless requirements.)
You have plenty of options for transmitting MIDI wirelessly, not necessarily under a network protocol: the CME line above (which is bluetooth), Roland’s WM-1 unit (which works via RTP-MIDI on Macs but, for Windows, requires a USB dongle), and lastly you can try some 5-pin to 5-pin MIDI wireless units. The top dog here is Pandamidi’s Midibeam, but the system alone is half the price of a Dwarf!
Bear in mind that any RTP-MIDI application will bring in some latency.
Now, here’s the thing:
Mod has implemented Ableton Link, as @danmh pointed out. If you run the MOD as Master Sync, you can connect either via Bluetooth or USB to one of the Macs (but both have to connect via Link too.) Mod has my eternal love for that feature alone!
(Not sure if Link does PC messages, though.)