Acknowledgments First I'd like to thank Jeff Kellum for giving me the oppor tunit y to write this impor tant book. Several people have assisted me in many ways, so I'd like to acknowledge their con- tributions and offer my sincere appreciation. Speci fically, I'd like to thank Quentin Docter, Eric Charbonneau, and Pete Gaughan for technical and developmental editing and suppor t and for keeping me on track throughout the process. My thanks also goes to A lexa Murphy for keeping me on track and helping me put all the fi nal, professional touches on the book. To the many people involved in this effort with whom I never worked with one-on-one -- thanks! It takes a great team to put together a great book. Finally, I'd like to acknowledge the encouragement and prayers of my family and friends and the students in my technical classes and Sunday school classes. I n H im, all things are possible!