I’d like to acknowledge the great work of Laurie Petrycki, the editor at O’Reilly, and the valuable information and review of the manuscript by Apple Computer, Inc. In addition, Justin Walker, Eugene Lee, David Mackler, and Adriaan Tijsseling offered helpful insight on the printer and sendmail configuration puzzles. I would also like to express my gratitude to Chuck Toporek and Chris Stone for their valuable comments on the draft manuscript. Thanks also to Christian Crumlish for his back-room assistance, and Tim O’Reilly for the opportunity to help revise the popular Learning the Unix Operating System book for the exciting new Mac OS X world. Oh, and a big grin to Linda, Ashley, and Gareth for letting me type, type, and type some more, ultimately getting this book out the door in a remarkably speedy manner.