S 5 And 6 Ict Theory Paper Caltec S.5

TABLE OF CONTENTS TOPIC 1: INTRODUCTION TO COMPUTING……………………………………………………...………2 TOPIC 2: COMPUTER MANAGEMENT…………………………………………………………...………36 TOPIC 3: COMPUTER LABORATORY CARE & MAINTENANCE…………………………….………47 TOPIC 4: COMPUTER HARDWARES ……………………………………………………………………63 TOPIC 5: COMPUTER SOFTWARES ……………………………………………...…………………….127 TOPIC 6: WORD PROCESSING …………………………………………………………..………………149 TOPIC 7: ELECTRONIC SPREADSHEETS ………………………………………………..…….………153 TOPIC 8: ELECTRONIC PRESENTATION ……………………………………….……………………158 TOPIC 9: DATABASE ………………………………………………………………………………………..161 TOPIC 10: ELECTRONIC PUBLICATION……………………………….……………………………….168 TOPIC 11: DATA COMMUNICATION & NETWORKING………………….…………………………..170 TOPIC 12: INTERNET AND WORLD WIDE WEB……………………………………………………….224 TOPIC 13: SYSTEM SECURITY, ICT ETHICAL ISSUES AND EMERGING TECHNOLOGIES…… 253 COMPUTER ABBREVIATIONS AND GLOSSARY……………………………………………………………277 TOPIC 1: INTRODUCTION TO COMPUTING Introduction to Computers Etymologically, the term computer is derived from a Latin word “Computare” meaning a calculating machine or a programmable machine. Therefore a computer can be defined as a multipurpose, automatic and electronic device that allows the user to input data, store data and information in its own memory, process input data and output information for future reference. It is an electronic device that converts raw data into meaningful information. It can also be described as an automatic machine made up of electronic and electromechanical device which manipulates and processes data. Characteristics of Modern computers 1. Speed Computers are quite fast in their operation in that their speed is measured in Millions of Instructions per Second (MIPS) or Megahertz (MHz). Inside the computer's system unit, the processing occurs through electronic circuits. Data and program instructions travel through these circuits at speeds close to the speed of light. Many computers process billions or trillions of operations in a single second. 2. Accuracy Computers are known to be accurate. They can process large amounts of data and generate error- free results, provided the data entered is correct. They hardly make any mistake. They are capable of detecting and correcting any mistakes made. It follows therefore, that if wrong data is fed into the computer, the resulting …