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─────Using Formatting Flags for Links───────────────────────────────────────
 
     You can use the \a and \v formatting flags to define explicit
     links. The \a flag is used to anchor a position where a "hot
     spot" for a link starts. The \v flag is used to insert invisible
     text. This invisible text contains the context you are linking to.
 
     Linking from a Single Word
 
     If you want to link from a single word to another topic, you do
     not need to use the \a flag. Simply insert the context string you
     are linking to immediately following the word, enclosing the
     string in string flag immediately following the word you want
     to link from. Following the flag, insert a context string for the
     topic you want to link to. The second \v flag marks the end of
     the context string──that is, the end of the invisible text.
 
     Linking from a Phrase
 
     If you want to link from a phrase, you must use the \a flag to
     define a hot spot. Use the \a flag at the beginning of the hot
     spot. The first \v flag──that is, the beginning of invisible
     text──marks the end of the hot spot.
 
     For example, the following text links from "several words" to a
     topic with context string "string":
 
          several words
 
     NOTE: A link must fit entirely on one line. You cannot continue
           invisible or anchored text over a line break.
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