[ns] Is it possible to do this scenario with NS2? ?

[Nadine Chen]

Hi,
Generally
with NS2, we can make a scenario in tcl and we fix  at the beginning
the number of nodes that will participate in this scenario, but if I
want that the number of the nodes increases during the simulation?
Is it possible to do this with NS2:initially we have  one node after 2 seconds another appears .....?
Please tell me if it is possible.
Thanks.