manage multiple sites with a single login My client wants urls site1.com and site2.com that share the same codebase for everything but the theme. They want different node content on each site.

They also want the ability to login to one location site1/user, and be able to update content from both sites there.

Is this possible with a multi-site install or Aegir?

If there are two different databases, it seems that you could not update content from both sites in one Drupal admin panel.
Sounds like you might be looking for the Domain Access module


  The Domain Access project is a suite of modules that provide tools for running a group of affiliated sites from one Drupal installation and a single shared database.