How to hook into incoming requests?

From: Baltz, Kenneth <Kbaltz_at_FIRSTAM.COM>
Date: Mon, 13 Jan 2003 14:04:43 -0800

I would like to be able to call a method for each request before any of my
web services get invoked. (If you're familiar with Log4J, I want to set the
NDC.) Is there any way to do this?