Security Management Many operating systems include some level of security. Security is based on the two ideas that: • The operating system provides access to a number of resources, directly or indirectly, such as files on a local disk, privileged system calls, personal information about users, and the services offered by the programs running on the system; • The operating …
Driver Management A device driver is a specific type of computer software developed to allow interaction with hardware devices. Typically this constitutes an interface for communicating with the device, through the specific computer bus or communications subsystem that the hardware is connected to, providing commands to and/or receiving data from the device, and on the other end, the requisite …
Operating System Types There are many types of operating systems. The most common is the Microsoft suite of operating systems. They include from most recent to the oldest: • Windows XP Professional Edition – A version used by many businesses on workstations. It has the ability to become a member of a corporate domain. • Windows XP …
Device Driver A Driver is a specialized hardware-dependent computer program, which is also operating system specific that enables another program, typically an operating system or applications software package, to interact transparently with the given device. It usually provides the requisite interrupt handling required for any necessary asynchronous time-dependent hardware interfacing needs.
Programming Languages Computers only understand binary codes so the first programs were written using this notation. This form of programming was soon seen to be extremely complex and error prone so assembler languages were developed. Soon it was realized that even assembler languages could be improved on. Today, a good programming language must be: • Totally unambiguous (unlike natural languages, for …
Computer Networks Definition Computer networking is the scientific and engineering discipline concerned with communication between computer systems. The word network can be used to describe a very large and complicated set of equipment. In its most accurate and simplest definition, a network refers to the cables and electronic components that amplify the signals going through the cables. The amplifying …
What is the Internet? The word internet is used to describe a network of networks which incorporate a very large and complicated set of equipment. To understand the internet, there are three areas of discussion which are very helpful. These include the various services provided across the internet, the functions that enable the internet to work, and the various …
Internet Services The main services used on the internet include: • Web browsing – Supported by the HTTP protocol, this functions allows users to view web pages using a web browser. • E-mail – Allows people to send and receive electronic messages. • Instant Messaging [Chatting]: Instant messaging using internet. • E-Commerce: Online shopping/trade. • Telnet : Remote Login service. • E-learning …
What is a Virus? A computer virus is one of the thousands of programs that can invade computer systems (both IBM PC and Macintosh) and perform a variety of functions ranging from annoying (e.g., popping up messages as a joke) to dangerous (e.g., deleting files or destroying your hard disk). Trojan horses or worms are specific types of …
Computer Viruses Introduction This document covers the basics on computer viruses. Please take some time to peruse the information to obtain an overall understanding of the concern and how to safeguard yourself from the dangers of viruses. What is a Virus? A computer virus is one of thousands of programs that can invade computer systems (both IBM PC and …
Types of viruses File viruses File viruses, also known as parasitic or executable viruses, are pieces of code that attach themselves to executable files, driver files or compressed files, and are activated when the host program is run. After activation, the virus may spread itself by attaching itself to other programs in the system, and also …
Virus Protection TO protect your laptop or PC From Virus A virus may or may not present itself. Viruses attempt to spread before activating whatever malicious activity they may have been programmed to deliver. So, viruses will often try to hide themselves. Sometimes there are symptoms that can be observed by a trained casual observer who knows what to …
Data security Data security is the means of ensuring that data is kept safe from corruption and that access to it is suitably controlled. Thus data security helps to ensure privacy. It also helps in protecting personal data. You may loose your data due to:- Data corruption It refers to errors in computer data that occur during transmission …
To keep your computer running smoothly and to ensure that it has a long and productive life, follow these tips. Keep the computer away from heat sources (like radiators and heat registers). Heat is a computer’s enemy. There is a fan built into the back of the CPU case. Keep this unobstructed and clean. A vacuum cleaner nozzle with a …
Introduction to Computer Ethics The introduction of the World Wide Web in 1990 has catalyzed the expansion of the Internet, which is still growing today at unprecedented rates. The recent growth of the Internet has resulted not only in an increase in the amount of available knowledge, but in an increase in the problems inherent to its …
Basic Computer Terms • Bit – A binary unit of data storage that can only be a value of 0 or 1. • BIOS – BIOS stands for Basic Input/Output System and it is a low level program used by your system to interface to computer devices such as your video card, keyboard, mouse, hard drive, and other devices. • Boot – A term …