At what level is the Mapping process "remembering" the mappings?

I've noticed that even when I say File>New...if I do a new a3d mapping...my Nomad is remembering previous mappings. What is the logic behind this? Is it remembering those mappings at the device level? Is this so theatres with house inventory don't have to keep remapping on every show, the device just remembers what the mappings are? Just looking for some clarification of how that works. 

thanks
Cory

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