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On subroutine threaded Forth systems, everything is object code. There are no traditional code or data fields. Only a word defined by CREATE or by a word that calls CREATE has a data field. Only a data field defined via CREATE can be manipulated portably.
The Core word set contains the essential body of words in a Forth system. It is the only required word set. Other word sets defined in this Standard are optional additions to make it possible to provide Standard Systems with tailored levels of functionality.