[ns] Way to access "node" object through an attached agent?

[Stanley M Bielski <bielski@ece.cmu.edu>]

Hello once again,

I am attempting to access a node object via its attached agent object. I
know that the class application has the [$self agent] method to retrieve a
pointer to its agent. However, looking at the agent.cc code, there doesn't
seem to be a similar method supported for accessing the node.

On the other hand, I can obtain the agent's source address through a
method in agent.cc. Is there a way I can access the node pointer via this
address w/o altering the ns source? 

Many thanks, wise ones!
-Stan