Nikon D3 - Manual (Page 31)

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Select Save/load settings > Save
settings in the setup menu to save
current camera settings to the
memory card in Slot 1 (if the memory
card is full, an error message will be
displayed). Saved settings can loaded
into any D3 camera using Save/load settings > Load
settings, allowing the same settings to be shared among
multiple cameras (note that Load settings is only available
if the memory card in Slot 1 contains saved settings).
Camera Settings: Sharing Settings