Looks like I sent the behind-the-firewall link, here are the external links. Scala Actors http://www.hpl.hp.com/techreports/2009/HPL-2009-148.html Rich Sharing http://www.hpl.hp.com/techreports/2009/HPL-2009-169.html If we were using 6-degrees of sharing, this sort of thing couldn't happen, of course :-) --marcs