Field codes in Word
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What are field codes?
Fields in Microsoft Word are used as placeholders for data that might change in a document and for creating form letters and labels in mail-merge documents.
Word inserts fields automatically when you use particular commands, such as when you insert a page number, when you insert a document building block such as a cover page, or when you create a table of contents. You can also manually insert fields to automate aspects of your document, such as merging data from a data source or performing calculations.
In Microsoft Word 2010, there is little need to insert fields manually, because built-in commands and content controls provide most of the capabilities that fields provided for many versions of Word. You are more likely to encounter fields in documents that were created in an earlier version of Word. For more information about working with field codes, see Insert and format field codes.