multisite shared users

I'm trying to figure out how to move from my current configuration to a Drupal multisite configuration and would love any help or suggestions. I have done some searching in documentation but haven't found anything to address this issue.

Here's what I've got now:

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here are steps for creating multisite with shared users that work for me please add any idea if you have

you must know how to setup vhost in apache

our domain for the site will be

http://example.com
http://site1.example.com
http://site2.example.com

1. first install drupal normally (we will call the database for drupal installation drupaldb)

2. after install drupal navigate to phpmyadmin or use mySQL gui tools and look for the database drupaldb (database you created previously )
   and look for these table

   'users' rename to 'shared_users',