Where does a SharePoint server keep note of it's config database?

The config database holds all the information that a SharePoint installation needs, e.g., "Where are the SharePoint databases stored?", "Does the installation have a separate index/job server, and if so, what is the name of this server?", etc. However, before a SharePoint server can connect to it’s databases, it needs to know where the config database is held.

The dsn definition for the config database is stored in the registry:

WSS 3.0 and MOSS 2007: HKLM\Software\Microsoft\Shared Tools\Web Server Extensions\12.0\Secure\ConfigDb