nickname - the user's display name, which, unlike the UIN, can be changed, and which is not unique, that is, it can be the same for different accounts.In the fall of 2011, an important change was made to ICQ: the ICQ service now supports multiple connections when using the same account.įor each account, the service stores the following data: The latest version of the mobile client for J2ME has the ability to log in using a mobile phone number, which becomes the login for a new user. This number is assigned to an account during the initial registration of a user in the system, after which, paired with a password, it can be used to authenticate in the system. To identify users, the service uses UIN (Universal Identification Number)- a unique number for each account, consisting of 5-9 Arabic numerals. To use the service, you need to register an account, which can be done through the client interface, as well as the Internet portal. ICQ is often used by technical support services for instant help. Some companies list UINs in contact lists on their official websites. As of December 2011, the total monthly audience of ICQ in Russia is 15.7 million (in the world - 27 million) (). Over the years, ICQ has released many clients and has undergone many changes. develops client programs and maintains an auxiliary web portal. In addition to providing the service itself, ICQ Inc. Following the reorganization of DST in September 2010, ICQ became part of the Mail.Ru Group. Since its inception, the service has been owned by its developer, Mirabilis, in 1998 it was sold to the American company AOL, and in April 2010 to the Russian investment fund Digital Sky Technologies (DST). The service is commercial, but its use is free. As with most powerful network systems serving a huge number of client requests, this server is not the only one and some of them are server clusters. Through the server, search and communication with other clients is carried out, and the exchange of service data, messages between users can be carried out both through the server and without its participation. The service user works with a client program (so-called messenger) running on a device connected to the Internet. ICQ is a centralized instant messaging service using the OSCAR protocol.

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