Two applications.

I have an application running on JRUN/APACHE. User logons are validated via session variables. The directory structure of the application is as follows

- App1
Dir1
Dir2

App1 is the root directory for the application.

I would like to add a second application called App2. So the directory structure will be

App1
Dir1
Dir2
App2
Dir1
Dir2

Both App1 and App2 will be two separate applications. One delivered as pure jsp pages and the second one is delivered as a *.WAR file.

Now my question is how can i use the session variables on App1. I would like the user to access App2 only if they had already logged on to App1. I know i could add App2 and App1 to be the same application but this is not possible as App1 is on a different project and they wont allow us to add our application.

Is there a way i can use the sessions on App1 to check whether users have logged on. The link to App2 is via a hyperlink on the main page of App1.

Thanks