3rd Party Password Protection: Is it possible?

Greetings everyone,

I want to create a third party login system (let's call it SuperPass)that gives users access to member sites.

Hence a user can go to any of the member sites, login in using the same username and password and hence gain access to the content.

I have seen it done on some sites. How is it done and how come it doesn't keep asking users to login for every page they view?

Thanks in advance

 

 

 

 

Top