GPO version numbers are an important part of the change-tracking process in any Active Directory environment, but are exponentially more useful in domains with multiple Domain Controllers. Any time that changes are made inside Active Directory, including any changes made inside Group Policy, Active Directory replicates those changes around the network to all Domain Controller servers. This replication process can take a few minutes, or a few hours, depending on the size and scope of your network and your DC configuration.
When you are making changes inside Group Policy and immediately testing those changes, you run the risk of pushing the changes to one Domain Controller, while your test client computer ...
