In addition to different content, you may also want to differentiate your domains in how they look and change some of the basic site settings to make them appear more as separate sites. In this tutorial we'll use the Domain Config and Domain Theme modules (included in the Domain Access package) to let us do just this. We'll change our settings on one of the sites to set the homepage node to the About page we created earlier. Then we'll make the Alumni site look quite different by giving it a new theme. Through this process you will understand things you need to watch out for when configuring Domain Access sites, and how to be appropriately cautious with your settings.
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This video covers a topic in Drupal 7 which may or may not be the version you're using. We're keeping this tutorial online as a courtesy to users of Drupal 7, but we consider it archived.