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  How do I create a structural (auto-open) .CDX/.NSX?:

  A "structural" .CDX or .NSX index (equivalent to dBASE IV's Production
  .MDX) is a compound index that is automatically opened whenever its assoc-
  iated database file is opened.  The structural .CDX/.NSX must have the same
  base name as the associated database file, and the extension must be ".CDX"
  in the case of SIXCDX or ".NSX" in the case of SIXNSX.

  To create a production .CDX, first open the database using the SIx Driver's
  SIXCDX flavor:

   // The VIA clause is not necessary if SIXCDX is the default driver
   USE DEMO VIA "SIXCDX"

   // Next, create one or more tags, either leaving off the OF <.CDX> clause:
   INDEX ON LNAME TAG LNAME

   // or specifying the same name as the database file:
   INDEX ON LNAME TAG LNAME OF DEMO.CDX

  If you are using the SIXNSX flavor of the SIx Driver, to create a struct-
  ural .NSX file, follow the same steps as above, but open the file VIA
  "SIXNSX".