DBFNTX Driver Installation and Usage
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     DBFNTX is the default RDD for CA-Clipper.  This new database driver
     replaces the DBFNTX database driver supplied with earlier versions of
     CA-Clipper and adds a number of new indexing features.  With DBFNTX, you
     can:

     .  Create conditional indexes by specifying a FOR condition

     .  Create indexes using a record scope or WHILE condition,
        allowing you to INDEX based on the order of another index

     .  Create both ascending and descending order indexes

     .  Specify an expression that is evaluated periodically during
        indexing in order to display an index progress indicator