Is there life after "Reveal Codes"?
http://word.mvps.org/FAQs/General/RevealCodes.htm

Barnhill, Suzanne
Word MVP Site, The
2005

Abstract:

There is nothing in Word directly comparable to Reveal Codes in WordPerfect. There is a very good reason for this. WordPerfect can be thought of (and I understand is) basically a text stream with codes interspersed (for more on this, see John McGhie's article on Word vs. WordPerfect). This is what you see when you Reveal Codes. You have codes or markers that turn on and off certain formatting characteristics. Word, on the other hand, is a series of nesting containers, characters inside words inside paragraphs inside sections inside documents. The formatting of these is by styles and by pointers at the beginning and end of the document.