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  Sx_I_IndexName():

  Syntax:  Sx_I_IndexName()

  Returns:   <char> File name of current index file being indexed or
                    reindexed,  "" if no index or reindex occurring.

  Description:    This function returns the name of the index file currently
                  being indexed or reindexed.  This function would be used
                  in a UDF (specified with the OPTION clause of INDEX or
                  REINDEX) to identify which index file is being indexed or
                  reindexed.

    NOTE:  This function is NOT supported under SIXNTX.

  Example:

    #include "SIXNSX.CH"

    USE TEST VIA "SIXNSX"             // TEST.NSX opened automatically
    REINDEX OPTION ShowIt() STEP 100

    FUNC ShowIt()

      // Bof() is .T. on first call to OPTION UDF.  Use this for setup.
      IF Bof()
          // Display the appropriate message
          ? iif(Sx_IsReindex(), "Reindexing ", "Indexing ")

          // Display the index file name and tag name.
          ? Sx_I_IndexName() + " : " + Sx_I_TagName()
          ?
          Return(NIL)
      ENDIF

      // Show how many keys have been included so far
      @ ROW(),1 SAY Sx_KeysIncluded()

    Return(NIL)