Chatting Server

Hello all,

I want to create a chat application in AIR but i dont know that how a chatting server can be created in Flash. Is there any webservice that will help me out or some thing else.

Basically i want to create the window application using AIR, so that which can communicate with the server, but i dont know anything how to establish to server that can handle the client requests give by my application. Plz help me out here...

Thankx in advance.