You may be thinking of document variables, which can only be accessed by macros or read by fields. Document properties are another possibility, but there are ways for users to see and update those without resorting to either VBA or reading them with fields. Either way, though, fields can't update document variables or properties. And yes, both are supported in Word 2013.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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