Multi user

Unity is a Java-based server that manages persistent XMLSocket connections. Using Unity, you can write multiuser games, chat, and other shared applications in Flash with minimal fuss, and that is good.

Unite communications and applications by adding streaming, multi-way audio, video, and live data to your websites and Rich Internet Applications. Built for streaming media, rich-media messaging, and real-time collaboration, Macromedia Flash Communication Server MX provides an easy, powerful, and open environment for developing groundbreaking communication functionality - and deploying it to the widest possible audience.