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  NTXPOS()                                            Miscellaneous Function
 Purpose..: Find the relative record number from an NTX file
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 Syntax...: NtxPos( <nNtxOrd>, <nRecNo> ) --> nNtxPosition

 Arguments: <nNtxOrd>= The current index order from INDEXORD().

            <nRecNo> = The "real" record number for which
                       to find the NTX position.

 Returns..: nNtxPosition - the record number's position in the NTX.

 Remark...: This function is useful for using elevator|scroll bars in
            an indexed TBrowse display. We need to find the NTX
            position once we have done a SEEK, for example, to
            reposition the thumb in the scroll bar display.

 Source...: NTXPOS.C
            Copyright: RCM Software Pty. Ltd.
            Author: Graham D. McKechnie
            Modified: Robert A. DiFalco
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 Example...: The example adjusts the scroll bar display after a
            seek has been completed in a TBrowse function.

              dbSeek( upper( chr( nKey ) ) )
              sbSetPos( aVSB, NtxPos( indexord(), recno() ) )