iMIDI is a freeware application from Granted Software (currently at beta version 0.2b) that runs in the background on OS 10.2 or higher, and allows for virtual connection between two computers on an Ethernet network. (iMIDI uses TCP/IP to transmit MIDI information between networked computers.) Using a “local loopback” feature, iMIDI also supports running a MIDI program such as Finale or Sibelius connected to a slave program such as Reason as a source for sounds and samples, all on one computer. In that regard, it’s like IAC, and somewhat similar to ReWire, though it carries MIDI information only, not audio.