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[ns] Event scheduling



Dear NS users,

(I'm not sure if I have sent it two times, I'm 
sorry if I have.)

If at time 0, I used the command "$ns at $r proc"
to schedule an event that happens 
at time $r, how can I make the event happen earlier
than $r? I mean, after I schedule the event, I 
want the event to happen at $x (0 < $x < $r), how 
can I realize this? 

Your help will be greatly appreciated!

S. Wu