How to access to web server's application, session variables in controller

Is it doable to access to current web server (Tomcat 6)'s application or session variables without creating a custom controller?

I am using Tomcat 6, and there are application and session scope variables (attributes) having some system environment values which I need to access to in my controller.

In other words, I need to access to HTTP application (or session) attributes in a WM controller.

Thank you,
Taeho.BPM