Starting A Session With WebWork Framework

Hello,
Read WebWork in Action, but first time actually coding to framework. I am converting a Struts site, in which I have a ECommerce site. I need to check browser for my site cookie, then begin a session in which user may enter goods into his cart. If no cookie, then I create a cookie and begin a session.

In struts I did this in the request processor. I believe in WW I need to do this with a interceptor, but not sure which one. And if that is the case, do I create my own interceptor or use something like "createSession" and extend it?

Thanks,
Scott
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