Mouse

The Mouse

Definition : The mouse is a pointing device for moving a cursor on the screen and allowing you to select, move, manipulate objects with buttons.

The following table describes all the actions performed by the mouse:

Action	Description
Pointe object	Put the mouse pointer on the object
click	Press and release a mouse button
Double click	Click twice successive
right click	Press and release the right mouse button to get the context menu
Click - Drag	Hold down the left mouse button and drag the mouse to the desired location and release

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Operating System

Operating System:

An operating system is software (all programs) background which provides communication between the processor and the user devices. It is the first program that can hold a computer. It manages the hardware and other software.

Examples: MS-DOS, Windows (95, 98,2000, XP, Vista ...), UNIX, LINUX ....

- The various types of operating systems:

The operating system most used today is Windows. But there are others such as MSDOS, Linux, Unix, ....

We can classify the operating systems into two main groups according to their modes of communication with the user:

· Operating systems work in text mode as MS DOS.

· Operating systems work in graphical mode as Windows and Linux.

- Basic Functionality of an operating system:

•      allows the computer to start and establish communication with the user.
•      is responsible for establishing communication between the hardware and programs.
•      connects the various devices connected to the computer.
•      helps organize records and files it contains.
•      supports reading / writing data to the disk or in memory.
•      displays information on the screen, interprets the keystrokes typed.
• Etc. ....

translated by google translate

Source : http://tanawiati.net/logiciel.htm

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Computer system & part of computer system

Computer system.

1. Definition:

A computer system is the automatic processing of information. It consists of two parts:

part of computer system

• The hardware (Hardware): all the physical components of the machine.
• The software part (Software): the sets of software (programs) of information processing.

The hardware: includes elements for receiving data for other process data and other elements communicate the results of treatment with the outside.

- Examples: Computers, Robots, calculators, mobile phones, ... etc..

Which are electronic devices (programmable machines) can process the information automatically (using programs).

- Components of a computer system: part of computer system

According to the definition of a computer system. We can deduce that the hardware consists of three units:

Input units to capture the data to be processed.

A processing unit or CPU "CPU" treatment, which consists of several elements:

· A central memory for storing information at the time of treatment (RAM).

· An arithmetic logic unit to generate the results from the data.

· A control unit for controlling the operations at the UAL.

· Organs storage to store information permanently (DDR)

Output units to communicate the results of treatment.

Computer system 

 2. Devices on a computer.

There are three types of devices:

- input devices that allow you to enter information in the direction of the computer.

- output devices that can retrieve the results of treatment.

- storage devices that maintain the data processed.

Examples of input devices:

Keyboard: The keyboard is an input device, it consists of a set of struts called keys by which you can enter text, numbers, commands. The information entered is sent to the CPU.

Mouse: The mouse is an input device to select it or move (folders, files .... etc..) Or launch programs using a pointer on the screen.

The scanner: an electronic device for taking an image of a document or an object. This image is transferred to a computer, to be subsequently stored, processed or analyzed.

  Examples of output units:

  The Screen: This is an output device that displays the information sent by the CPU in the form of text or image.

  Printer is an output device that can print images or text displayed on the screen by editing on paper.

Speakers: Multimedia computers have speakers connected to the sound card to enjoy the benefits of digital sound.

 Examples of storage devices:

Hard Drive: This is a storage medium formed of rigid metal plates coated with a magnetic coating cylindrical shape. It contains the operating system. A hard disk is characterized by:

-Its speed "from 4500 to 7200 rev / min, 10,000 rev / min"

-Storage capacity "60 to 500 GB."

Disk: The disk is a storage means for transferring information or hold computer data.

He has two kinds: 5'' 1/4'' and 3 ½.

Or USB Flash memory: It is a small removable accessory that connects to the USB port of a computer. It contains a recordable and erasable memory. Found USB sticks from 64 MB to several GB

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