Don't make changes to the workbook when it's open.
Don't have macros run that make changes to the workbook.
Don't use volatile functions that recalc (and tell excel that the workbook has
been changed). Some of these functions are =now(), =rand(), =date(),

ebbs wrote:

When I exit a workbook I am not asked if I want too save the changes. How do
I fix that?

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Dave Peterson