Unicast to different agents?

[Lam Chi Yung <chiyung@cs.ust.hk>]

Hello,
	I am a newbie to ns. I would like to build an agent which
communicates with agents in different nodes. 

	I am deriving a class from UDP. Problem arises, however. Suppose
I have the following scenario: 

	Agent A is in Node 1
	Agent B is in Node 2
	Agent C is in Node 3

	I would like A to send packets to B and C. It is not successful
for some cases, though. 

	Is there a way to send packets to agents in different nodes?
Many thanks!

Yours,
Chi-yung