Define is multi user operating system.

Windows 2000 is a multi user operating system. a multi user operating system allows multiple users to use the same computer at the same time and/or different times.

Define multiprocessing?

In multiprocessing, multiple programs are executed on different processors at the same time. Some operating systems have features of multiprocessing and to control these type of tasks. In multiprocessing, operating system divides a task between different processors.

Define is multitasking?

Multitasking is the capability of an operating system to load multiple programs into memory and to execute them at the same time. For example, a user can print a document on printer, while editing another document and so on.

What is meant by drag events?

This event triggers when you press the left mouse button and move the mouse while keeping the left mouse button pressed. This event is used to select more than one item at a time, or to drop an object into another application.

What are mouse events?

Mouse events are the actions that can be performed by using the mouse following are most common events triggered with a mouse.

Ø Left click.

Ø Right click.

Ø Drag etc.

What is control panel?

The control panel is a special folder that contains the administrative tools (system software) used to perform system management tasks such as installing/uninstalling hardware devices, managing system resources, sharing printers, and setting up data and time etc.

What is windows explorer?

Window explorer acts as a directory browser and file manager for windows. It provides an efficient way for locating and managing files on your computer. It also provides the most efficient way to manage the computer resources.

What is Recycle bin?

The recycle bin is special folder of windows on the hard disk and has an icon on desktop. It contains files and folders that deleted from the hard disk. Any files and folders you deleted from the hard disk are transferred to the recycle bin. These files or folders can be restored from the recycle bin to their original location if required for use.

What is desktop?

The on screen work area on which application windows, icon, menus, and dialog boxes appear is called desktop. It is called desktop because the surface of screen looks like a desk with objects you might have on your own personal desk.

What is windows operating system?

Windows is popular GUI operating system developed by Microsoft Corporation. It widely used in business, educational institutes and research organizations.

What is command line operating system?

A command line operating system provides a command prompt to the user for typing different commands to interact with computer. The commands are given to the computer according to the predefined format. It is not an easy way to interact with computer. The user needs to memorize commands to perform deferent tasks. Examples of command line operating system are DOS (disk operating system).

What is graphical user interface operating system?

A GUI operating system provides a graphical user interface to communicate the user with computer. It provides graphical objects such as icons, menus, windows, buttons etc. to the use to perform different tasks. Examples of GUI operating system are windows, Linux, and Solaris etc.

What is meant by software copyright?

Software is like any other property. Software copyright is the right to use on the computer. The software company who develops the software keeps copy right with it and distributes by cost. When you purchase commercial software, you are paying for a license to use the software.

What are anti viruses?

The special programs that are used to detect and remove the viruses from the computer are called anti virus programs. A large number of anti virus programs are available. The MacAfee and Norton are examples of most popular anti virus programs.

What is meant by password?

A secret word or code assigned to documents and programs, or computers system to prevent unauthorized access is called password. You have to type the correct password to open the system.

What is copyright?

The principal law governing software piracy is the copyright act 1976. some amendments were made in this law in 1983 and now software piracy is believed to be a punishable crime. It may involve huge amounts of penalties.

What is meant by privacy?

Privacy is the act of limiting the access of information (or computer resources) from unauthorized users. It is the right of a person to keep his personal information away from other people. An individual has a right to see the data about him.

What is Trojan?

It is virus, which is the part of some computer game programs. When game program is installed in the computer and run, this virus is activated. An example of Trojan horse is format C.

What is logic Bomb?

Logic bomb is a virus, which is activated on the basis of a logical condition. Examples of conditions that can be used as triggers for a logic bomb are the presence or absence of certain files, a particular day of the date etc. one this virus is triggered, the important data stored into a computer may be deleted or corrupted.

What does the chernobal virus?

The famous chernobal virus deletes all the Microsoft Office files and also the partition information from the disk one the partition of the disk is deleted, the important data on the disk cannot be acceded.

What does the boot sector virus?

The boot sector virus modified the program in the boot sector and is loaded into memory whenever computer is turned on

What is pirated software?

The software, which is installed into your computer without license is referred to as pirated software.

What is computer virus?

A small program that gets into your computer and distribute the normal functions of the computer and destroys the important data stored in the computer is called computer virus. The computer virus cannot damage hardware, only data or software is corrupted.

what is meant by security of a computer system?

Security is a system of safeguard designed to protect a computer system and data from damage or access by unauthorized persons.

Write three main characteristics of computer?

Computer has the following main characteristics:

1. Speed
2. Accuracy.
3. consistency

What is computer based training (CBT)?

Computer based training (CBT) or presentation is also called computer aided instruction (CAI). In this method, computer is used as an aid to teach the students in the classroom. The instructions of particular subject are received from the computer and are taught to the students.

What is computer aided learning (CAL)?

Computer aided learning (CAL) could be described as the use of information technology to assist in the teaching and learning process. The use of computer in education can reduce time that is spent on preparing teaching materials. It can also reduce the administrative load associated with teaching and research. A teacher prepared slides and delivers lecture to the student through computer.

What is computer simulation?

A computer simulation is a special type of computer model which provides the behavior of a system that might exist outside the computer (i.e in the real life). Simulations are often used to train people or students when:

Ø It is impossible to build system due to economical problems.

Ø Direct experimentation is impossible in real life due to dangerous of the system.

Ø System is yet available.

What is computer aided manufacture (CAM).

Computer aided manufacture is a software which used digital design output generated by CAD system and controls all the parts of a manufacturing process.

What is computer aided design (CAD).

Computers are also used for the design of products. The computer aided design (CAD) software is used to design the samples, or models of the products.

What is robot?

A robot is an automatic programmable machine that moves and performs mechanical tasks. It means that a robot acts like human beings. Robot can work in environment that is dangerous for human beings such as opening chemical packages and packages believed to contain bombs. It can perform repetitive task continuously with any break, at very high accuracy than human.

What is meant by electronic banking?

One of the most popular used of e-commerce is electronic banking. An electronic banking is also known as cyber banking. It includes various banking activities conducted from home, a business, or on the road instead of a physical bank location. Usually the people pay their utility bills through their bank accounts using this facility.

What is electronic shopping?

Many businesses now have website that allow internet users to but goods or services. Shopping can take place using a computer at home, or at a cyber café. The e-shop can anywhere in the world and it remain open 24 hours a day.

What is video conferencing?

A videoconference is a meeting between two or more people residing at various places. They can watch and talk with each other. They use a network (i.e. internet). Video conferencing provides a normal meeting environment. It enables both parties to see, hear and present material, just as if they are in the same room.

What is office automation?

Office automation (OA) refer to the process of automating office tasks. In an office workers perform different tasks using computer. Many offices use the computer technology to perform various tasks.

Write the names of fields where computer is commonly used?

Business, industry, medical, airline system, education, weather forecasting, home.

What are the news groups?

These are discussion groups or forums that provide the services to exchange messages on the internet (not on the web, which is only one area of the internet) about a particular subject. Newsgroups are classified by subject and do not necessarily deal with journalism or new. Health, hobbies, celebrities, and cultural events are subjects or many newsgroups.

What is search engine?

Search engines are the special websites that provide facility to internet users to search information on the internet. Search engines maintain a list of billions of web pages containing information on variety of topics.

What is URL?

URL stands for Uniform Resources Locator. Every page has a unique address on world wide web. This called uniform resource locator (URL). If you want to access a web page on the world wide web, you will have to specify the URL of the required page in the web browser.

What is the web browser?

A web browser or simply a browser is software that allows the internet users to find, retrieves, view, and send information over the internet. Many web browsers are available but the most commonly used web browsers are Microsoft internet explorer and Netscape navigator.

What is web browsing?

Searching information on the World Wide Web is referred to as web browsing. A software known as web browser is used to search a view web pages.

What is DNS?

DNS stands domain name system. the human readable name assigned to the computer server on the internet is called the domain name. it is a common and unique text name and is alternative to an IP address. The domain name system (DNS) stores the information about domain names and their corresponding IP addresses. For this purpose DNS server is used, which translates the domain name into its IP address.

What is IP addressing?

IP stands for internet proctocl. It is a unique identifier for a host or node on the internet. It is numerical address with four numbers separated with dots. A typical IP address looks like this 216.27.61.137.

What is gopher?

Gopher id an internet service that organized resources into multilevel menus to make finding information easier on the internet. Before gopher, it was difficult to find information on the internet.

What is file transfer proctocl?

FTP stands for file transfer proctocl. It is a way for transferring files from one computer to another. The process of transferring a file from a network computer to your local computer is called downloading. The process of transferring a file from your own computer to the server on the internet is called uploading.

What is an e-mail?

e-mail stands for electronic mail. It is the most popular services or facility provided by the internet through which we can electrically send and receive message anywhere in the world.

What is world wide web?

The World Wide Web is simply referred to as web. It consists of a world wide collection of electronic documents stored on the special servers known as web servers. These documents are known as web pages. The web pages are accessible on the internet. So we can easily access the information available on the internet.

What is ISP?

ISP stands for internet services provider. It is a company that provides the internet connections to the users. There are many ISP companies in each big city of each country of the world. You have to get an internet connection form any ISP company of your local city to connect to the internet.

What is TCP/IP?

TCP/IP stands for transmission control protocol/ internet protocol. It is a real communication protocol that drives the internet. Every computer to access the internet must be installed TCP/IP. This protocol provides connectivity between browsers and servers on the internet for data communication.

What is the extranet?

An extranet is a network of multiple intranets. It means that intranets of different companies are connected together for the collaboration among the companies.

What is the intranet?

An organization network through which the files and messages can exchanges among the users of the organization only is called the intranet.

What is internet?

The internet is the network of networks around the world. It is made up of thousand of smaller, national, regional, governmental, academic and commercial networks. It is global network.

Define physical layer of OSI model?

The physical layer of OSI model is the bottom most layer. This layer is related to the transmission media for data transmission. This layer controls and co-ordinates the transmission of data in the form bit stream over a physical medium such as coaxial cable, optic fiber cable etc. it also defines the rules by which the bit are passed from one node (computer) in the network the next.

Define the data link layer of OSI model?

This layer of OSI model is responsible for carrying a packet of data from one computer (or router) to the next. It is also responsible for the reliability of the physical link established at physical layer. This layer provides for the error free transfer of data from one computer another. It checks whether the data has arrived properly and safely at the destination.

Define network layer of OSI model?

This layer of OSI model ensures the delivery of data packet from source to destination. It means that this layer is responsible for carrying data packets from one computer to another or from node to node.

Define transport layer of OSI model?

This layer of OSI provides a mechanism for the exchange of data between source and destinations. It breaks large message from the session layer into segments to be sent to the destinations computers. At the destination computer, it reassembles the data segments and presents the data to the session layer. Transport layer also sends an acknowledgement of receiving of data of to the sender.

Define session layer of OSI model?

This layer of OSI model establishes maintains and manages connections between communicating systems or devices, so that they can talk to each other. These connections called sessions.

Define presentation layer?

This layer of OSI model performs data transformations to provide a common interface for user applications. It means that data is translated between the formats the network requires and format the computers of the end users expect.

Define application layer of OSI?

The application layer is the topmost layer of OSI of model. It provides services directly to the application programs, to access the network. It provides user interface to send and receive information by the user.

What is OSI Model?

OSI stands for open system interconnection. OSI model is also known as OSI reference model. It is used for networking. It was created by the international standard organization (ISO) to provide a logical framework for how data communication processes should take place across networks.

What is groupware?

A software is used for workgroup computing. This software known as groupware. It allows many users or researchers to work on their projects by sharing the same domain of information online. A groupware also permits the individuals to collaborate (work together) with their colleagues inside the organization by means of linked commuter (computer network).

What is workgroup?

In a computer network people can work together as a group even when they are thousands of miles away from each other. This concept of working together is called workgroups.

What is group computing or collaborative computing?

The phenomenon of sharing information among various members of workgroup through computer network is called working computing. The workgroup computing is also known as collaborative computing.

What is mesh topology?

In mesh network each nose is directly connected to all node on the network. This type if network involves the concept of routes. In this type of network, each node may send message to destination through multiple paths.

What is tree topology?

In tree network, the nodes are connected to each other in such a way that forms a tree line structure. Typically to form a tree network, multiple star topologies are combined together onto a bus. In this simplest form, only Hub devices connect directly to the tee bus. Each hub functions as the root of tree of devices.

What is star topology?

In a star network, each node or device is directly connected to a central connection point known as “Hub”. The central connection may be an actual Hub or a switch. Typically, the nodes or devices are connected to the Hub with unshielded twisted pair (UTP)

What is ring topology?

In a ring network, each node is connected to two adjacent nodes or neighbors for communication purpose and forms a closed ring or loop. In this way the last node connects to the first node to complete the ring. In this network, all messages travel through a ring in one direction (clockwise or anti clockwise from node to node.

What is bus topology?

In bus network, all nodes (or devices) are connected to a common communication medium or central single cable. This single cable is called bus. The devices or nodes are attached with the central (or bus) through interface connector.

Define the term network topology?

In networking, the term topology is the way of connecting nodes (or devices) on a network. In other works, a topology represents the shape of network.

What is Hybrid network model?

The hybrid network had combined features of both client/server and peer to peer networks (or arrangements). It has a server and the users can share the data and software. Similarly, each node can store its own files, programs, and had its own peripheral devices.

What is peer-to-peer network model?

In peer to peer arrangement, all nodes (or computers) on the network have equal status. No one has control over others. It means that there is no central computer to control other computers. Each computer stores files on its own storage devices and has its own peripheral devices. The users can share each other’s data and devices (or resources) as and when needed.

What is client/server network model?

In client/server network (or arrangement), the clients are all computers or nodes on the network and sever is a central computer that controls the network. In addition to control the network, the server also provides a centralized storage area for programs and data. It has hard disks that hold the shard data file or database.