Check out this link to a web page of John McGimpsey:

http://www.mcgimpsey.com/excel/udfs/sequentialnums.html

--
HTH,

RD
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Please keep all correspondence within the Group, so all may benefit!
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"flowbee" wrote in message
...
I have been requested to provide a unique number for a workbook each time
the
workbook is opened. Is there any way Excel can automatically do this?