Umm, that's what the tutorial is all about... Any kind of mailmerge in Word uses fields - mostly mailmerge fields. The tutorial goes far beyond the simple use of those fields, however.

If you want to see the inner workings of a given field in the tutorial, select it and press Shift-F9, per the instructions in the Introduction. Alternatively, you can toggle the field code display for all fields via Alt-F9 (Optn-F9 on a Mac).

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]