at the recent USENIX in San Diego, a 90 minute presentation on this topic was presented by invitation http://www.mit.edu/people/wsanchez/papers/USENIX_2000/ --dan - Subcription/unsubscription/info requests: send e-mail with "subscribe", "unsubscribe", or "info" on the first line of the message body to discuss-request at blu.org (Subject line is ignored).