Also, in Mountain Lion the traditional software update application still exists if you need it. It does not require a login. 

Go to Macintosh HD>System>Library>Core Services and you will see an application called software update. Use that and you can run all updates without issue.

-Logan Cooke
The Warren School

On Aug 9, 2012, at 2:40 PM, Craig Lyndes @ wrote:

> go to the update page it says we need to log in using an
> iTunes account, and from this point on that iTunes account will be the
> only account able to update those apps.