How do I Automatically generate numbers in Word or excel

I need to set up a document that each time I either open of save/print
automaticly gives it a unique sequencial number
Example Invoices

You may want to look at how J.E. McGimpsey does it:
http://mcgimpsey.com/excel/udfs/sequentialnums.html

He shows a couple techniques.

Dave W wrote:
>
> I need to set up a document that each time I either open of save/print
> automaticly gives it a unique sequencial number
> Example Invoices

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Dave Peterson