Check user

Hi everybody!

I have a question: 
My idea is: every page load i check the user is
logined or not with a isLogin(); method.
When the user is logined the program is running. When
the user is not logined redirect to login form.

I read the documentation but i found nothing about this.

Has anybody some idea about the implementation with Zend_auth
or some documentation (url), or something...?

I searched in the Google without results.

Thanks for help and sorry my english!

Andras

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