Upgrading a W2k domain to W2K3

Hi all.

I am investigating the correct way of running adprep /forestprep and adprep /domainprep to upgrade the client’s AD 2000 domain to AD 2003.

I think i got the procedure documented but what worries me is how do i ensure that each individual domain controller has received the change? There are over 300 domain controllers for the client across the country.

I want to make sure that when I run the forestprep part all domain controllers have received the update before running the domainprep part? The domain structure consists of a root domain, a child domain and a further child domain.

Any help would be appreciated.