thanks kin,
yes i have studied this even http://www.ros.org/wiki/ROS/Master_API and
http://www.ros.org/wiki/ROS/Parameter%20Server%20API . there is also a
python program given on http://www.ros.org/wiki/ROS/Master_API which I run
but i get error:
caller_id: command not found
bash: test.py: line 4: syntax error near unexpected token `('
bash: test.py: line 4: `m =
xmlrpclib.ServerProxy(os.environ['ROS_MASTER_URI'])'

Cannot I see the entries information about the nodes in tabular form? i.e
which node is connected to which node? 
regards
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