multicast

Hi All,

Is there any multicast technology other than IP,Overlay,Application
Layer multicasting.I have a model where there are few groups and each
group contains few members. For a simple Let there are two groups and
in each group there is one leader.All the groups are interested in
receiving in the same information sent by any of the members of the
groups. So I need to use multicasting in this case, I can get the
information about all the participants in the communication from a
central server.
I request any one is having an idea on this type of communication
situation or any resourses are welcome. I thinking to use TCP and UDP
protocols for signaling and data transfer between supernodes and within
each group.Is there any other way better than this to use?

Thanks in advance.
warrior