The following instructions apply to setting up the Domain Access Module to work with Organic Groups in Drupal 5.
The requirement was to have a main site where admin controls the content and a subsite where registered users are able to create groups and post content. Admin then has the power to publish any chosen content from the subsite to the main site. It is conceivable that this set up would work with multiple subsites and not just one.
The subsite(s) is/are a subdomain of the main site.