Section 1 Introduction 1.1 COMMUNICATIONS Computer communications is the process of sharing data‚ programs‚ and information between two or more computers. We have discussed numerous applications that depend on communication systems‚ including: • E-mail – Provides a fast‚ efficient alternative to traditional mail by sending and receiving electronic documents. • Instant messaging – Supports direct‚ “live” electronic communication between two or more friends or buddies. • Internet
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Computer Programming: Even Driven Programming: This is the process where the flow of the program is determined by certain events such as: * Senor output * User actions i.e. mouse clicks‚ key presses * Messages from other programs * Threads As users we have come across event driven program every day when we use a computer i.e. navigating through our computer user interface‚ also whilst playing computer games. By clicking on the mouse the computer picks up the event that has been
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ksheetIntroduction to computers Directions: Fill in the blank. 1. Microcomputers‚ different from those giant mainframes and supercomputers‚ are designed for individuals. In fact‚ the microcomputer is often called the PC 2. DESKTOP and LAPTOP computers are the most commonly seen microcomputers. 3. Just like human beings‚ computers communicate through receiving and sending messages. We refer to those message receiving components as INPUT devices and those which send messages as OUTPUT
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Computers are commonly used items in many areas. It is an important thing to people‚ especially the people who run organizations‚ industry‚ etc. . . Almost anything you know is run or made by computers. Cars and jets were designed on computers‚ traffic signals are run by computers‚ most medical equipment use computers and space exploration was started with computers. Most of the jobs today require the use of computers. These ’mechanical brains ’ made a huge impact on our society. It would be hard
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Computer Networking Type A: Very Short Answer Questions 1. Ans: 2 Ans: 3 Ans: 4 Ans: 5 Ans: 6 Ans: 7 Ans: 8 Ans: 9 Ans: 10 Ans: 11 Ans: Define a network. What is its need? A computer network is a system in which computers are connected to share information and resources. Computer networks help users on the network to share the resources and in communication. Write two advantages and disadvantages of networks. Advantages: 1. Data or information can be shared among the user. 2. Fast communication
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22/10/2007 11:28 Page 320 CASE EXAMPLE Lenovo computers: East meets West In May 2005‚ the world’s thirteenth largest personal computer company‚ Lenovo‚ took over the world’s third largest personal computer business‚ IBM’s PC division. Lenovo‚ at that time based wholly in China‚ was paying $1.75bn (A1.4bn‚ £1bn) to control a business that operated all over the world and had effectively invented the personal computer industry back in 1981. Michael Dell‚ the creator of the world’s
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Computer Security Many commercial software packages are designed with computer security features that control who can access the computer. These types of access controls use a process called identification and authentication. Identification verifies that the user is a valid user‚ and authentication verifies that the user is who he or she claims to be. Three common methods of authentication are remembered information‚ possessed objects‚ and biometric devices. With remembered information‚ a
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“Timeline Of Computer” 600’s bc The abacus is developed in China. It was later adopted by the Japanese and the Russians. 600’s ad? Arabic numbers -- including the zero (represented by a dot) -- were invented in India. Arabic translations of Indian math texts brought these numbers to the attention of the Europeans. Arabic numbers entered Europe by means of Spain around 1000 ad and first became popular among Italian merchants around 1300. Until then‚ people used the Roman system in western
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often computers and related equipment are being involved in the educational process nowadays. This tendency of wiring schools‚ exercising long distance learning‚ and depending on the internet for information is apparently being actively promoted. Lately‚ politicians and some educators have begun praising computers as the new technological universal remedy‚ “the one that will turn classrooms into cybernetic gardens for growing young minds” (EMC Paradigm Publishing). The utilization of computers in education
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Computer Networks Does anyone really know what networking is? “In the world of computers‚ networking is the practice of linking two or more computing devices together for the purpose of sharing data” (Networking Fundamentals). Now this is a great explanation but does this really help us understand? Networking has grown over many years. Where did networking come from? Lets go back to the beginning and find out how far we have come. Network research can be traced back to around the 1960’s.
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