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   Overlaying Advantage RDDs
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   Advantage RDDs can be overlaid with your source code with a real mode
   linker, such as Blinker, RTLink and WarpLink, which can overlay C and
   Assembler object files. Link scripts have been provided to help define
   which Advantage RDD modules can or cannot be overlaid.

   Note:  If you are running in protected mode (extended memory) or dual
   mode, it is NOT recommended to overlay any files. Supported protected
   mode linkers at this time include Blinker 3.0 and newer, ExoSpace, and
   CauseWay.

   The chart below shows the link script file names provided with Advantage
   which define the proper overlay definition.

   Linker               Version                 Advantage File Name
   ----------------------------------------------------------------
   Blinker              1.5 and newer             DBFAXS_B.LNK
                        (real mode only)
   RTLink               (shipped with Clipper     DBFAXS_R.LNK
                         5.2)
   WarpLink             2.0 or later              DBFAXS_W.LNK


   Note:  Use one of the provided scripts to overlay the DBFAXS.LIB
   file. These link scripts are to be used only if you are not running
   your application in protected or dual mode.

   Warning:  Do not overlay the communication libraries. The
   communication library modules are frequently used. Overlaying the
   communication library could lead to very poor performance.