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How to Correctly Set up Drupal Multisite?

Issues, solutions and configurations related to multisite

I have two sites running from the same Drupal4.7 instance as explained in install.txt.

These two sites have seperate databases but share users. I did this
by editing $db_prefix in the slave site's settings.php. As explained at
http://drupal.org/node/22268.

I got errors like "Duplicate entry.." when trying to create a new user. As if the sequences table was not being shared.

A list of modules that promise different levels of User and Content Sharing across sites plus my 2cents.