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Drupal 7 Multi-sites Configuration by Matt Butcher

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Shared authentication

One often-desired feature on multi-site installations is to share user accounts across sites. The term "user accounts" is ambiguous, though. Do we want Single Sign On (SSO), where the same username and password work in various sites, or do we want something more—like having entire user profiles synchronized across our multi-sites?

Often, loosely affiliated sites will share authentication credentials, allowing one to use the same credentials to log in on multiple sites, yet each site will have its own user-specific profile where the user can, for example, set a profile picture or write a biography. This method is sometimes called Single (or Shared) Sign On (SSO).

Sites with a stronger affiliation may require a greater degree ...

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