rtpMIDI 

Create communication lines between DAW musical software components present on different computers connected over the Internet or a local network. Transfer data without the need for physically connecting MIDI cables. Make audio tracks and copy them in a synchronized environment.

The rtpMIDI-driver is a virtual MIDI-driver which allows DAW-applications to communicate via network with other computers. With this driver you don‘t need to connect long MIDI-cables between your music-workstations. The configuration is implemented to closely resemble the network-MIDI-configuration in OS X‘s Audio/MIDI-setup.