[flommer]

I don't think you can "link" them, per say, other than to take the summed stereo output of one system into the other, probably via the rca spdif. Then you can link the transports with MIDI with one acting as the slave.. The two sessions will still be independant on the 2 individual macs with one acting as the final or master. Sounds kinda cumbersome to me, but depending on your application and considering you already have the gear you might as well give it a try..