Share users database on different WordPress installs

wp-config.php

# http://www.remicorson.com/share-users-database-on-different-wordpress-installs/

# The two worpdress installs have to be on the same database, with different table prefix
# wp-config.php form the second website :

define('CUSTOM_USER_TABLE', 'wp_users');  // wp_ is the table prefix from the first website
define('CUSTOM_USERMETA_TABLE', 'wp_usermeta');  // wp_ is the table prefix from the first website

define('COOKIE_DOMAIN', '.yoursite.com'); //replace with the first website url
define('COOKIEPATH', '/');

/* That's all, stop editing! Happy blogging. */