Multisite Analytics and Domain Mapping

Hi.

Is Multisite Analytics compatible with Domain Mapping? In other words:
- For network-wide and subdomain tracking, what does actually happen if a subdomain is mapped to a custom domain name and if the associated site is navigated through that custom domain name?
- What domain name should the users setup in their Google dashboard: the original blog address or the mapped domain name? What if they map a domain name afterwards?

Thanks.