I've used it myself.

Nevertheless, it adds complexity with minor gain. It changes a view-only
screen to an editing screen that has limited function, doesn't show
non-printing characters that do make a difference in editing just seem
unnecessary. If instead the time that went into that went into fixing
numbering....
I guess it is a question of priorities.
--
Charles Kenyon
Word New User FAQ & Web Directory:
http://addbalance.com/word
Intermediate User's Guide to Microsoft Word (supplemented version of
Microsoft's Legal Users' Guide)
http://addbalance.com/usersguide
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