Vista installation source

[Murman]

I looked around for a while yesterday trying to figure out Windows Vista installation source in the registry. In 2K & XP you can change the install source in HLKM\software\microsoft\windows\currentversion\setup

values source path and installation source.

Where is this in vista? I was looking over a vista system yesterday and I want to say the contence of the Vista DVD in in system32\ but i just want to make sure. If that's so there's no need for a installation source anymore because it's all on the local disk now...?

Thanks