Yes, those are the instructions. Here is another version of the same
Share users between two blogs
Here are some brief notes on how to share a user table between more than one installation. All installations must be in the same database, using different table name prefixes. The prefix is set in the wp-config.php file.
Share users between two blogs
Put them both in the same database with different prefixes. Then choose one of them to be the master user table. Then do this in both wp-config.php files:
define(CUSTOM_USER_TABLE,’wp_users’);
define(CUSTOM_USER_META_TABLE,’wp_usermeta’);
Replace the wp_ with the prefix you want.
In other words, you designate the user table from ONE installation as the master user table which will be used by the other installations instead of their own user table. This PHP code must go in the wp-config.php file in all the installations that you want sharing a single user table. You can have more than two installations set up the same way. Their tables must all be in a single database however.
