From the site:
Efficient multimedia delivery over public networks is a challenge for modern technology. Insufficient bandwidth, network latency, paranoid firewall restrictions and many more obstacles make it very difficult to transfer streaming content to end users, especially in real-time. Existing Media servers, such as Microsoft and Real Networks ones, only partially cover growing demand for streaming quality.
The product presented on this site – Unreal media server – is a Media server for Windows operating systems, that dares to compete with above mentioned servers from the standpoint of quality and performance.