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  Sx_Warm():

  Syntax:   Sx_Warm([[nTagNo | cTagName,] nOrder | cIndexName])

            nTagNo     = Position of tag within compound index file
            cTagName   = Name of the tag
            nOrder     = Position of index in list of indexes
            nIndexName = Name of the index

  Returns:  <logical> .T. if successful, .F. if an error occurred

  Description:  This function converts a "Changes Only" index or tag to a
                "Full Update" tag or index.  After this conversion all
                changes made to records with keys currently in the tag or
                index are updated.  New records are automatically added
                to the tag or index.

    NOTE:  This function is NOT supported under SIXNTX.

  Example:

      // Assume that CUSTOMER.DBF also has a structural index
      // (CUSTOMER.CDX).   SPECIAL.IDX created on AcctNo.

      USE Customer via "SIXCDX"  // Opens CUSTOMER.DBF and CUSTOMER.CDX

      SET INDEX TO Special       // Open SPECIAL.IDX,  Note CUSTOMER.CDX
                                 // is moved to index order position 2

      Sx_Warm(1)                 // Make special offer available again
                                 // to new customers.  See Sx_Chill()
                                 // example

      AddCustomer()              // Add customer.  Customer's account
                                 // number will be stored in
                                 // SPECIAL.IDX as long as it remains
                                 // warm.