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  • Propagation of Radio Waves (802.11)

    Propagation of Radio Waves In order to be able to install a wireless network, and in particular to place the access points so as to get the best range possible, a little background should be given on how radio waves propagate. Radio waves ... Read more

    October 16, 2008 at 09:43 AM
  • Introduction - Databases

    What is a database? A database (abbreviated DB) is an entity in which data can be stored in a structured manner, with as little redundancy as possible. Different programs and different users must be able to use this data. Therefore, the ... Read more

    October 16, 2008 at 09:43 AM
  • Proxy and reverse proxy servers

    Proxy servers A proxy server is a machine which acts as an intermediary between the computers of a local area network (sometimes using protocols other than TCP/IP) and the Internet Most of the time the proxy server is used for the web, and ... Read more

    Local Area Network
    October 16, 2008 at 09:43 AM
  • grpconv - grpconv.exe

    grpconv - grpconv.exe grpconv.exe (grpconv stands for Windows Program Group Converter) is a Windows NT/2000/XP generic process used for converting program groups from older versions of Windows. The process grpconv is not in any way a virus ... Read more

    Windows processes
    October 16, 2008 at 09:43 AM
  • Execution phase of a project

    Execution phase Preparation Before beginning the execution of the work, it is necessary to take the time to break the project down into tasks in order to plan the performance of these tasks and determine what resources need to be mobilized ... Read more

    Project management
    October 16, 2008 at 09:43 AM
  • Data transmission - Analogue transmission

    The principles of analogue transmission Analogue data transmission consists of sending information over a physical transmission medium in the form of a wave. Data is transmitted via a carrier wave, a simple wave whose only purpose is to ... Read more

    Data transmission
    October 16, 2008 at 09:43 AM
  • PNG format

    PNG format The PNG format (Portable Network Graphics or Ping format) is a bitmap (raster) graphic file format. It was developed in 1995 in order to provide a free alternative to the GIF format, which is a proprietary format whose rights ... Read more

    October 16, 2008 at 09:43 AM
  • PS/2 connector

    PS/2 connector The PS/2 connector (mini-DIN6 format) is mainly used to connect computers to keyboards and mice. Pins Pin number Function 1 DATA 2 Not ... Read more

    Cables and connectors
    November 10, 2010 at 08:57 AM
  • Computer - History

    The history of the computer owes its existence to the fact that people, who are lazy by nature, have always sought to improve their ability to calculate, in order to reduce errors and save time. Origins: The abacus The "abacus" was ... Read more

    Computer history
    October 16, 2008 at 09:43 AM
  • Quality - Process Management

    The Concept of Processes The process model consists in considering a company's goal to be to provide products and/or services that meet client expectations. Thus, the company is modeled as a series of processes that allows the company to ... Read more

    October 16, 2008 at 09:43 AM
  • Viruses - Introduction to viruses

    Virus A virus is a small computer program found within the body of another program which, when run, loads itself into the memory and carries out the instructions programmed by its author. The definition of a virus may be: « Any computer ... Read more

    Viruses and threats
    October 16, 2008 at 09:43 AM
  • Intrusion detection systems (IDS)

    Introduction to intrusion detection systems An IDS (Intrusion Detection System) is the term for a mechanism which quietly listens to network traffic in order to detect abnormal or suspicious activity, thereby reducing the risk of intrusion ... Read more

    Intrusion detection
    October 16, 2008 at 09:43 AM
  • Telnet protocol

    Introduction to the Telnet protocol The Telnet protocol is a standard internet protocol enabling terminals and applications to interface over the Internet. This protocol provides the basic rules making it possible to link a client (system ... Read more

    Internet (protocols)
    October 29, 2012 at 03:45 PM
  • Network equipment - The hub

    What is a hub? A hub is an element of hardware for centralising network traffic coming from multiple hosts, and to propagate the signal. The hub has a certain number of ports (it has enough ports to link machines to one another, usually 4, ... Read more

    Local Area Network
    October 16, 2008 at 09:43 AM
  • FTP commands

    The FTP protocol FTP (File Transfer Protocol) is a protocol — meaning a standard language that lets two machines communicate — used so that computers of different types (or with different operating systems) can transfer files over a ... Read more

    Networking tools
    October 16, 2008 at 09:43 AM
  • Preparatory phase of a project

    The preparatory phase The term preliminary project is generally used to refer to all preparatory stages necessary for the launch of the project. Thus, the idea is to precisely define the nature of the project in order to finalize the ... Read more

    Project management
    October 16, 2008 at 09:43 AM
  • ISP - Internet service providers

    What does ISP mean? ISP literally means Internet service provider or provider. It is a service (most of the time paid for) which allows you to connect to the Internet. Why use an ISP? Unless you have a specialized line (other than a ... Read more

    Internet Utilities
    October 16, 2008 at 09:43 AM
  • Web server attacks

    Vulnerability of web services The first network attacks exploited vulnerabilities related to the implementation of TCP/IP protocol suites. With the gradual correction of these vulnerabilities, attacks have shifted to application layers and ... Read more

    October 16, 2008 at 09:43 AM
  • Style classes (CSS)

    Classes and IDs Classes A web designer might want to assign different styles to the same tags. For this reason, the CSS specifications introduced the concept of classes. The definition of classes is as simple as that of styles. It involves ... Read more

    October 16, 2008 at 09:43 AM
  • Linking two PCs with a null modem cable

    Linking two computers without network cards The best way to link two computers is to use an RJ45 cable to connect the machines' network cards. However, when one or both of the computers has no network card, there is still a fairly easy way ... Read more

    Cables and connectors
    October 16, 2008 at 09:43 AM