Can I control two Macs with one keyboard & mouse simultaneously?

I'm presently the operator and head audio tech for a major Off-Broadway show. I'm running the show on Ableton Live 6 through a Mac Mini, using a MOTU 828mkIII as the Firewire audio interface to the console. "Show control" is basically straight music playback, plus arming and disarming loops, triggering sound FX cues, and stopping and starting playback. The show has been exceedingly stable, no real reason to worry - but the fact that I don't have a redundant backup system concerns me. Theoretically, I can use our Denon CD players to run the show off of discs I've burned, but it's only viable for me because I know the show; a sub running the show would be up the creek - and if we hit a snag and run out of loops, forget it. Furthermore, those of you who've worked with Live know that in a performance based/show control situation, you can remain in an audio loop indefinitely, without any worry of a CD running out of prerecorded loops. (This is a specific reason why we're using Ableton for this show - the music can keep "vamping" until automation and rigging give me the clear to proceed.)
Considering that I'll be taking some time off this summer, I don't want this to be a concern for my sub(s), so I've charged myself with the task of building a redundant backup. Problem is, I'm not sure how to do it.
What I've been looking at is a dual Ableton Live/Mac Mini/Firewire interface system. Basically, to duplicate what's running the show presently, and have it running in tandem while the main playback system goes to the house - but for both to be controlled by only one mouse, keyboard and screen, so there's no delay in the event of a crash. If one fails, I send the audio from the backup into the theatre. There would be no disruption of playback, except for the operator`s response time in switching to the backup`s audio output.
Software like Synergy and Teleport let me share a single keyboard, mouse, and screen over two or more computers - +but only control one computer at a time+. And I've looked for KVM switches and USB "splitters" but they also seem to be toggle devices between one or another computer - which leads me to think I may have to network the two...
Any ideas are appreciated, even the obvious ones, as I may have overlooked some or assumed some to be out of the question.
That`s basically it - *simultaneous realtime* control of two computers from one keyboard and mouse. Both Minis performing the same task at the same time.
Is there software/hardware that can do it, or can I network the backup as a "slave" that mimics the master?
Thanks.

Perhaps you could setup a parallel processing network:
http://daugerresearch.com/pooch/
The website was last updated 5 days ago according to Google. Hopefully their server will be back up soon. I noticed it wasn't connecting when I tried.

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