How to do Single Sign On functionality using CAS module in Drupal 7?

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Please go through these three requirements and help me with possible solutions. In Drupal 7, If I created an Account with username 'xyz' and password 'abc' for Also I have sub-domain
1) How to maintain only "User Account Registration Table" common for both websites?
2) If I login to main site and if I open a subdomain website in another window then it should automatically Logged in?
3) I tried every thing in localhost. Is it work in localhost?

In Drupal 7,I found using CAS Module we can do this.. I tried a lot from two days, and I am not getting any result.
One of the useful link I tried.. . I stopped here.. http://yoursite/admin/config/people/cas . In people, this above link is not found... Add CAS Username link is there. Please give me the working solution.
Hello Jsinha, Thank you for your question. Here is a link to a Drupal Addon titled Multisite Login, which allows a user to login to multiple websites with different domain names. If you have any further questions, feel free to post them below, or contact live Tech Support. They are available 24/7 via: Email: [email protected] Phone: 888-321-HOST (4678) 757-416-6575 (Intl.) & Chat (there is a link on the top right). Thank you, -John-Paul