SET ORDER
 Set a new controlling index
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 Syntax

     SET ORDER TO [<nIndex>]

 Arguments

     TO <nIndex> specifies the new controlling index by pointing to its
     position in the list of open indexes in the current work area.  This
     number can be in the range of zero to 15.

     If <nIndex> is not specified, ORDER is SET to zero.

 Description

     When you SET ORDER TO a new controlling index, all indexes are properly
     updated when you either append or edit records.  This is true even if
     you SET ORDER TO 0.  After a change of controlling indexes, the record
     pointer still points to the same record.

     SET ORDER TO 0 or SET ORDER TO with no argument restores the database
     file to natural order (record number order), leaving all indexes open.

     To determine which index is the current controlling index, use
     INDEXORD().

 Examples

     .  This example shows typical uses of the SET ORDER command:

        USE Customers NEW
        INDEX ON Lastname TO Names
        INDEX ON City + State TO Region
        SET INDEX TO Names, Region
        //
        SET ORDER TO 2
        ? INDEXKEY(INDEXORD())      // Result: City + State
        //
        SET ORDER TO 0
        ? INDEXKEY(INDEXORD())      // Result: null value
        //
        SET ORDER TO 1
        ? INDEXKEY(INDEXORD())      // Result: Lastname

 Files:  Library is CLIPPER.LIB.