Acknowledgments

We are grateful to Erich Nahum, Jeff Mogul, and the anonymous reviewers, whose comments have helped to improve this paper. Thanks to Michael Pearlman for our Solaris testbed configuration. Special thanks to Zeus Technology for use of their server software and Damian Reeves for feedback and technical assistance with it. Thanks to Jef Poskanzer for the thttpd web server, from which Flash derives some infrastructure. This work was supported in part by NSF Grants CCR-9803673, CCR-9503098, MIP-9521386, by Texas TATP Grant 003604, and by an IBM Partnership Award.