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  Sx_Freeze():

  Syntax:  Sx_Freeze([[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 "Full Update" or "Changes Only"
                index or tag to a "No Update" tag or index.  After this
                conversion no automatic updates are made.  All changes to
                the tag or index must be done using Sx_KeyAdd() and
                Sx_KeyDrop().

    NOTE:  This conversion is NOT reversible!

    NOTE:  This function is NOT supported under SIXNTX.


  Example:

    // Assume that CUST.DBF also has a structural index (CUST.CDX)
    // SPECIAL.IDX created on cust->ACCTNO.

    USE cust VIA "SIXCDX"      // Opens CUST.DBF and CUST.CDX

    COPY FILE special.idx    ; // Copy special offer index to OFFER1
           TO offer1.idx

    SET INDEX TO offer1        // Open OFFER1 index

    Sx_Freeze(1)               // Freeze index, so that no more
                                // customers can ever be added or
                                // deleted.