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The underlining commands are somewhat obsolete. The
underline-region function actually inserts `_^H' before each
appropriate character in the region. This command provides a minimal
text formatting feature that might work on your printer; however, we
recommend instead that you use more powerful text formatting facilities,
such as Texinfo.
Command: underline-region start end
This function underlines all nonblank characters in the region defined
by start and end. That is, an underscore character and a
backspace character are inserted just before each non-whitespace
character in the region. The backspace characters are intended to cause
overstriking, but in Emacs they display as either `\010' or
`^H', depending on the setting of ctl-arrow. There is no
way to see the effect of the overstriking within Emacs. The value is
nil.
Command: ununderline-region start end
This function removes all underlining (overstruck underscores) in the
region defined by start and end. The value is nil.
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