Thanks to those who helped:

• Colleagues who have helped us develop and understand videoconferencing.
• Reviewers: Rod Bond, Rick Flott, Bill Guthrie, Dave Hein,
  Bruce Kravitz, Arch Luther, Joon Maeng, Peter Salus,
  Barry Shein, Errol Williams, anonymous reviewers.
• Editors: Debbie Lafferty and Tom Stone
• Owners of figures, pictures and text we reproduced
• Family, especially: Col. Charles Abbitt, Susan Combs,
  Caroline Abbitt Sauer