I have a WordPress-based site and also have other sites that don't use frameworks. I have a desire to use my WordPress account and password to log in to my other sites.
I know that WordPress uses phpass to encrypt and verify passwords. I have been able to use phpass on other sites to authenticate the login stored in the WordPress database.
I want to know, how can I log in with my WordPress account when I log in to other websites? In other words, how does WordPress implement remembering the login state?