“Post Processor” is just the formatting and configuring instructions for generating g-code.
A CAM program usual has a folder somewhere with the various post processor files that is uses. Each machine’s processor is a separate file. Usually with one for metric and one for inch.
This is done so you can add, edit or modify them as needed. (They are fairly straightforward and you can easily read, write or modify them yourself once you have a few examples to work off of.)
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