C5 RDD Functions

          MEMOSETSUPER() :

Set an RDD inheritance chain for the DBFMEMO database driver

         MEMOSETSUPER([<cSuperRDD>]) --> cOldSuperName

RDDLIST() :

Return an array of the available Replaceable Database Drivers

RDDLIST([<nRDDType>]) --> aRDDList

RDDNAME() :

Return the name of the RDD active in the current or specified work area

RDDNAME() --> cRDDName

RDDSETDEFAULT() :

Set or return the default RDD for the application

         RDDSETDEFAULT([<cNewDefaultRDD>]) --> cPreviousDefaultRDD