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  OrdKey():

  Syntax:   OrdKey( <cOrderName> | <nOrder> [, <cIndexFile>] )

       cOrderName = The name of the Order (or tag) to be created.

       nOrder = An integer that identifies the position in the Order List
                of the target Order whose cForExp is sought.

       cIndexFile = The name of the index file containing one or more Orders.
                    You may specify <cIndexFile> as the filename with or
                    without the path name or extension.  If you do not inc-
                    lude the extension as part of <cIndexFile>, the default
                    extension of the currently active RDD is assumed.

  Returns:

     Returns a character string representing the expression from which the
     Order was created.

  Description:

     OrdKey() is an Order management function that returns a character
     expression, cExpKey, that represents the key expression of the specified
     Order.

     You may specify the Order by name or with a number that represents its
     position in the Order List.  Using the Order name is the preferred
     method.

     The active RDD determines the Order capacity of an Order Bag.  The
     default DBFNTX and the DBFNDX drivers (as well as the SIx Driver's
     SIXNTX flavor) only support single-Order Bags, while other RDDs may
     support multiple-Order Bags (e.g., the SIXCDX and SIXNSX drivers).

  Example:

     USE test VIA "SIXCDX"
     INDEX ON test->LAST TO LAST FOR test->AGE > 35
     ? OrdKey( "LAST" )      // Returns: "test->LAST"