Access session scope variables from a filter

I have a filter I am using to check if 2 people are loged in with the same user name.
When my web app loads I store the user name in a class that has session scope.
Is there a way for me to access this class from the Filter class?
How do I access the session instance from this class?
How do I pass parameters to the Filter class?
Thank you,
Al

http://forum.java.sun.com/thread.jspa?threadID=5122925&tstart=0

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