Server

The server application is a C program that is composed of two basic functional units:

Listening application.

This is the main thread of the program. The listening application will listen on the csicq port and accept connections from users. Once a connection has been established, it is being managed by a new thread running the connection control application.

Connection control application.

Every user has a thread in the server ``taking care'' of their connection. The connection control is responsible for both listening on the user port and forwarding the requests to the ICQ network and listening on the network, forwarding events from the ICQ network to the user.

The server uses three types of external mechanisms in order to enable its correct operation.