[ns] how to schedule event in ns

["Xiao Xuan" <xuanxy@hotmail.com>]

Hi, everyone,
    I want to use ns to do something in wireless mac. I find that there is a 
member varibles -- Event intr_ in file mac.h. But I don't find any initials 
or assignments for it. In file  mac.cc, I also find that a function 
following uses this variable.
void Mac::sendDown(Packet* p)
{
	Scheduler& s = Scheduler::instance();
	double txt = txtime(p);
	downtarget_->recv(p, this);
	if(!abstract_)
		s.schedule(&hRes_, &intr_, txt);
}
Can someone give me some explanation?
    Btw, in function Scheduler::instance().schedule(uptarget_, p, delay_) , 
uptarget_  is a pointor to NsObject object. But the schedule's definition is 
schedule(Handler* h, Event* e, double delay). I read the ns manual ,but feel 
it is not so comprehensive.
Tks in advance. :)

Xiao Xuan
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