thank you for your response,really appriciated...but it is using URL,is there any example available which uses peer-to-peer technology like skype does in it's groupchat?
no, there is not such an example available. It makes also no sense.
Group Chat is not peer 2 peer, its 1 peer to many peers. Which means you would have to send the same bytes to every peer which increases your traffic by the number of recipients.