Suzanne, Charles, and Jezebel -- You all have been very helpful. Thank
you.

Turning spellcheck off on the style does indeed work. If I end up
going with this trick, I'd probably want to "bury" the text box in the
header and footer area, to discourage users from messing with it.

Putting field codes in AutoText entries only seems to work if you
actually *use* such entries. That is, defining them isn't enough. But
maybe that's what you were saying, Charles. The trouble with this, of
course, is that I am still faced with hiding the codes. However,
defining the codes in AutoText still seems to be a good idea, because
they can then be used to easily restore them.

I didn't quite follow Jezebel's DocVariable suggestion at first, but I
saw how it worked after playing with it. Defining my codes as the name
of the DocVariable achieved exactly what I wanted. The codes worked,
they were completely hidden when field codes weren't displayed, and
also took up no space. I can even insert carriage returns between
several field codes within a single DocVariable for improved
readability. Just what the doctor ordered.

Thanks again to everyone.