使用Wordpress和zend框架来服务同一个网站

My web site is running two server side applications: application for logged-in users running on PHP (using Zend framework) and Wordpress application for the public, non-loggedin users. I am using Apache.

I would like that requests from logged-in users Would be served by the index.php file of Zendframework and those from non-logged in users by Wordpress index.php file.

Note, I prefer not to have different URLs for the two frameworks. For example: mydomain.com should lead to both sites according to the log-in status.

One way I thought doing this, is by always starting at Zend, check if the user is not logged-in, and if so perform _forward or similar action to Wordpress.

Is that possible? Should I do something else? Thanks.