in AS3 you can access RTMFP (Real Time Media Flow Protocol) using the classes: NetConnection, NetGroup, NetStream, etc.

Circulate is an API designed on top of all this

few examples:

• send messages at the network level
• send commands automatically serialized/deserialized
• create your own commands
• allow easily to share files in different way (p2p, direct stream, DHT)
• locate another user in the group ring
• etc.

You can use Circulate

• to share files between different clients
• sync different devices and/or screens
• create chat rooms
• etc.