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[ns] global variables possible?



In a wireless ad-hoc environment, is it possible 
to introduce a "global" variable that every node 
can read and write information during the simulation, 
so that by checking this global variable, tcp agent
can determine exactly what's going on in real time
during simulation? 

Where should we add this global variable, what
might be some options and problems of doing this? 
Would be very appreciated for your suggestions!

Zhenghua