Zend Server & Concrete5

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Hi
Can anyone offer any advice on optimizing Zend Server settings for Concrete?

I'm using the full version of Zend Server which has Full Page Caching but I need to let Zend Server (ZS) know when not to cache because the user is logging/logged in. The options given by ZS are; GET, SERVER, SESSION, COOKIE and ZS checks these to decide if the fully cache the page.

Which of these should I use and how?