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Acknowledgments

I would like to thank

• Jerry Saltzer, my thesis adviser, for his detailed criticism of this thesis. He helped me, in particular, to chose my words more carefully and use them more precisely.

• Mitchell Charity for many conversations that helped to shape the design and implementation of the system described in this thesis. He frequently provided a valuable sounding board for ill-formed ideas.

• Tara Gilligan and my parents, Bill and Judi, for their patience and support as I finished a thesis that took longer than any of us expected. My father, who as a writer and editor is so familiar with finishing the manuscript, offered exactly the encouragement and commiseration I needed.

This work was supported in part by the IBM Corporation, in part by the Digital Equipment Corporation, and in part by the Corporation for National Research Initiatives, using funds from the Advanced Research Projects Agency of the United States Department of Defense under grant MDA972-92-J1029.