true "word wrap"

[Matt Armstrong]

Is there a way to get "true" word wrap in emacs?  I.e. not
auto-fill-mode and not (setq truncate-lines nil), but something
similar to (setq truncate-lines nil) that wraps the display on word
boundaries.

The dominance of Visual C++'s ability to do this in its editor has
made 80 column source code a rarity where I work.  :-(

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