External Authentication

Hi, I am newbie in yii. I trying to authentication in simple php page, In that page have link to yii application . When click the link that authentication automatically established in yii without login page, . That means external authentication in yii. how can i do that? Sorry for my english.

what exactly you want to do?

I trying to external authentication in yii framework.

So you want to pass some kind of token that authenticates you in Yii?

yes. i try to implementing sso with non-yii applications.

They do not happen to sit on different subdomains?