Output to as many projectors and LED surfaces you’d like by connecting multiple machines to form a d3 network. Control all slaves from one master and use the understudy system to provide backup to cover hardware failure.
Set up your network of d3 machines using the Slave Manager. Assign a feed to each machine, edit feeds for all machines in the same place, set up your active understudy backup system, read the status of all the other machines, and control them all from one master machine.
Let your master machine (which also can output content) control the timeline, sequence, projector lineup, blending among many other parameters of your slave machines, in frame-accurate sync. Once configured there’s no need to touch the slave machines at all. Once setup let the master machine boot up, close down, restart and refresh all the slaves.
Active understudy backup
Don’t spend money and engineering time having one dedicated backup machine for every active machine running your show. Instead, use one understudy machine replace any other machine in your d3 network, including the master, in case of unexpected failure.