Forcing users to update spreadsheets

I run a main spreadsheet linked to 40 individual spreadsheets used by others. I would like to force users to update their spreadsheet when opening. How could this be best done? I was hoping there may be a way for drop down lists in the 40 spreadsheets to remain empty unless they update. Can this be done? or is there a better way?

doesnt excel ask to update links?
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paul
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"DKerr" wrote:

>
> I run a main spreadsheet linked to 40 individual spreadsheets used by
> others. I would like to force users to update their spreadsheet when
> opening. How could this be best done? I was hoping there may be a way
> for drop down lists in the 40 spreadsheets to remain empty unless they
> update. Can this be done? or is there a better way?
>
>
> --
> DKerr
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