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.

Icq messenger wont leave fullscreen