-For example, @code{box[0101]="|"} sets @samp{|} as the character to
-use for a single-width vertical line, and @code{box[1100]="\xda"} sets
-@samp{"\xda"}, which on MS-DOS is suitable for the top-left corner of
-a box, as the character for the intersection of two single-width
-lines, one each from the right and bottom.
-
-The defaults use @samp{-}, @samp{|}, and @samp{+} for single-width
-lines and @samp{=} and @samp{#} for double-width lines.
-
-@item -O init=@var{init-string}
-If set, this string is written at the beginning of each output file.
-It can be used to initialize device features, e.g.@: to enable VT100
-line-drawing characters.
-
-@item -O emphasis=@{none|bold|underline@}