The SC-800/1000 Synchronized Control can be used in a several different configurations. 

One potential configuration uses multiple Dust Source Equipment, so long as the amperage is less than 32A total, multiple machines can be hooked up to a power distributor that is wired to the Synchronized Control which then connects to the main power and powers on the G-800/G-1000 wirelessly. 

See photo below using one control for two dust sources and one dust processor. 

Another configuration that can be done is to use multiple controls, one per each machine potentially. This would only be needed if the amp draw is higher than 32A total for the two machines to not be able to run off of one controller.