Passing Parameters to a FILTER?

I've developed an ISAPI filter that looks for a cookie on a client machine, and if it's there
then I allow the URL Request to go thru, otherwise, I reDirect them.

Is it possible to pass parameters to a filter?
Right now, I've got the cookie that I'm searching for hard-coded in the FILTER, but this actually needs to be dynamic.

Is this possible?


Thanks for your time in advance.

Paul Tomsic