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[ns] quesion about accessing variable in different class




 1 --------> 2 -------> 3

as above, node 1 is attached with a traffic generator(such as CBR); there is an UDP agent attached to node 2;

I am making some changes to CBR_traffic.cc, and I want to get some information from the UDP agent. 
For example, I have a pointer *PacketCount in UDP.cc , how can I access this variable in CBR_traffic.cc??

thanx 

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