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   RDD Basics
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   Advantage commands and functions operate in work areas. Each work
   area is associated with a single database driver. When a table
   is opened in a work area, the RDD used for that work area is
   automatically used for all operations on that table.

   You can replace the default CA-Clipper RDD (DBFNTX) with an Advantage
   RDD and run your CA-Clipper applications.  For simple replacement, no
   re-compiling is usually necessary.  Simply relink your application with
   Advantage RDD files.  However, if you want to access the advanced
   functionality of Advantage or if you want to use an Advantage RDD and
   other RDDs in the same application, you may need to include one of the
   Advantage header files in your source code and re-compile your code.
   Also, if you application selects a specific RDD with a VIA clause, a
   header file may be required.

   Note:  Some examples of the advanced functionality supplied by
   Advantage are BEGIN TRANSACTION and SET AXS LOCKING.