You can create a shared session on all multisites with the help of Multisite Login module. The module allows users to login to all sites in a multisite configuration. This also concerns multisites that don’t share domain names.

E.g.:

• politicker.com
• politickernj.com
• politickerny.com
• etc.

Note: If you use a few sites on the same domain (for examplee, politicker.com, nj.politicker.com, ny.politicker.com, etc.) then you do not need this module. Base functionality of Drupal multisiting has the ability to share logins for such sites.

Multisite Login was created to be an alternative to the singlesignon module but it uses a technique that doesn’t block search engines from acessing your site.

Requirements

• Using a multisite installation.
• Using a separate database for each site (no table prefixing)
• Shared tables for users of all sites