[support] A beginner's questions

Hi, I'd like to set up a VPS hosting two sites (in two different domains), on top of Ubuntu (Debian) Linux. I'd like to know the following: - how do I configure the two sites, sharing a single Drupal installation, to use different configuration and databases? My web server is Apache; - is it possible to theme different parts of the same site differently? E.g. my wife would probably prefer different colours for her blog than I would for mine :-) TIA, Kofa