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  Roll-Your-Own Indexes:

  Roll-Your-Own indexes (or RYO's) are the ultimate in index control.  You
  can create an empty index with the INDEX command using the EMPTY keyword,
  and then add or remove individual record to or from the index at will.
  RYO's are treated a bit differently from normal indexes.  They are updated
  normally if the records they contain are changed, but records are not
  automatically added or removed.  That way you have absolute control over
  what your index contains.

    NOTE:  See the RYODEMO.PRG program for a practical example of how
           an RYO index can be used.