To Setup a Multicast Environment

Hai techrepublicans, Wish u all a Happy New Year 2010. I’m Doing a project on “Key Distribution in Multicast Environment” . For that first i need to setup a simple multicast environment with about 5-6 Laptops as a group and Send and Receive messages. So can u please guide how can i form a multicast group with this laptops and how to send and receive messages…. It is just for simulation purpose to show it to the external….