MS document that it is possible to create a share for dynamic updates for the automated install process, using winnt32.exe /duprepareathname to prepare this folder, and winnt32.exe /dushareathname as a switch pointing to the folder during the install.

I take it that this is only for said 'Dynamic Updates' and not the standard critical updates etc...

But, I can't find any way of obtaining said dynamic updates on the windows update catalog. Is this just a feature that was never implented?