When you calibrate data, TPC looks to see if a particular file is involved. If so, TPC stores a reference to that file with the calibration.
CAD Files
This is very handy when calibrating CAD objects. Once TPC knows what calibration to use, it can continue to use that calibration as you interact with that CAD file.
When you send or transfer data between the CAD View and the Drawing View, TPC uses the calibration referenced by the CAD file to automatically calibrate data between the two.
