Michael Khairallah is president, Security Design Solutions of Covington, La. His book, Physical Security Systems Handbook – The Design and Implementation of Electronic Security Systems (Elsevier, Butterworth Heinemann), is available at $49.95 and can be ordered through the Elsevier Web site at www.elsevier.com or telephone (800) 545-2522 or write Elsever, Order Fulfillment, 11830 Westline Industrial Drive, St. Louis, Mo. 63146.