《实用操作系统概念(影印版)》讲述了：Copyright 2000 John Wiley & Sons.Inc.All rights reserved. No part of this publication may be reproduced，stored in a retrieval system or transmitted in any form or by any means，electronic，mechanical，photocopy，recording，scanning or otherwise，except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act. without either the prior written permission of the Publisher, or authorization through payment of the appropriate per. copy fee to the Copyright Clearance Center,222 Rosewood Drew，Danvers, MA 01923。（978）750～8400，fax（978）750～4470.Requests to the Publisher for permission should be addressed to the Permissions Department. John Wiley &Sons，Inc.，605 Tabbed Avenue, New Y0rk，NY 10158～0012，（212）850～6011，fax（212）850.6008 E-Mail：PERMREQ@ wILEYCOM.All rights reserved AUTHORIZED REPRINT OF THE EDITI0N PUBLISHED BY JOHN wILEY&SONS,INC.,New York,Chichester,Weinheim，Singapore，Brisbane，Toronto. No part of this book may be reproduced in any form without the wrier permission of John Wiley & Sons.Inc.This reprint is for sale in the People's Republic of China only and exclude Hong Kong and Macau。