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paste it in wp-config.php and make sure the prefixes are right (wp_* is default) 
also the blogs must be installed on the same database with different prefixes.
For example, you might have a primary blog with the table prefix wp_ on the database wordpress_blog and you install a new blog on the same wordpress_blog database but with a different prefix (this is important) - you can share the the primary blogs already populated user tables (in other words a shared login).
                also the blogs must be installed on the same database with different prefixes.
For example, you might have a primary blog with the table prefix wp_ on the database wordpress_blog and you install a new blog on the same wordpress_blog database but with a different prefix (this is important) - you can share the the primary blogs already populated user tables (in other words a shared login).
                            
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