Currently Being ModeratedFeb 3, 2014 2:47 PM (in response to mpmsfam)
You can set up (through the IAC driver in Audio Midi Preferences) a Network. (plenty of YouTube videos on How To)
You could use a MIDI cable from one Mac to the other.
You could get a MIDI device, and assign MIDI control to the RECORD transport button
You could use an external ASCll keyboard and assign a key to do it.