E-mail - is the most massive service on the Internet, providing the exchange of emails between users. The advantages of this Internet service are: message transmission speed (tens of seconds); an e-mail can contain only text, but also a file (enclosed) containing sound, graphics, video, program; messages can be sent to several recipients at once; you can configure the mailbox to automatically execute certain commands (delete messages from a particular user, etc.), etc.
To work with the mailbox, there are special programs, the most common of which is Outlook Express, developed by Microsoft. Outlook Express is integrated into the Microsoft Office suite.
There are websites offering free of charge anyone who wants to register a mailbox, for example mail.ru, yandex.ru, rambler.ru, etc. The advantage of mailboxes registered on these websites is that to work with them do not need special programs, just download the page using any available browser.
Internet Service Tools
The main service Internet services are Telnet, Ping, Whois, Finger, etc., each of which performs certain functions, namely:
• Telnet - a program that allows you to remotely control any computer on the network, work on it from anywhere on the network. It is used to run the program on the server or on any computer on the network;
• Ping is a utility for testing connections on a TCP/IP network, can be used to test the possibility of remote access to the network;
• Whois, Finger - services that allow you to determine the coordinates of the user on the network that runs on a particular computer.
News (Usenet teleconferencing system)
This is a news service containing a set of documents (articles) grouped by various topics. Usenet provides an opportunity to read and send messages on a topic of interest to all participants of the discussion group, to which anyone can join. There are news servers (special computers) supporting the teleconferencing system, which consist of many thematic conferences. Newsgroups are hierarchically organized into thematic groups, names of which consist of the names of their sublevels, for example group comp.sys.windows belongs to the group "computers", to a subgroup of "operating systems", more specifically to Windows.
You can become a participant in the system of teleconferences by registering on the corresponding news server. Registration consists in registration of a subscription to a news group of interest. A registered user can exchange messages with all users, as well as with the authors of a particular message. Moreover, users can create thematic groups and subgroups of news on their own.
Instant messaging on the network - IRC and ICQ
These are network protocols that allow users to communicate in real time. The text typed by the user is immediately displayed on the screen of one or several participants in the communication process. Like teleconferencing, users can create a group of like-minded people to communicate in real time. If the computers of subscribers can play sound and are equipped with microphones, then with the help of the corresponding software it is possible to organize voice communication in real time. There are special programs (Skype, Messenger, etc.) that allow realizing the process of voice communication and video communication in real time.
The service allows you to communicate over the Internet with a telephone subscriber in real time. The advantages of this service are low cost of calls. At the moment, the quality of Internet telephony is low because of time delay and distortion of sound.
The principle of Internet telephony is the following. The Internet user server is connected to telephone channels and can communicate with any telephone. The subscriber's telephony server is connected to the Internet and can communicate with any computer on the network. The Internet user's server receives a telephone analog signal, digitizes it and sends certain packets over the Internet to the end user. For information packets sent from the Internet to the telephone server, the communication process is carried out in the reverse order.
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