[ns] What is the meaning of opt?

[ddd wwqq <ding_wq@yahoo.com.au>]

Can some one tell me what is the meaning and funtion
of opt?

set opt(tr)	out
set opt(ltr)    lan
set opt(stop)	20
set opt(num)	1
set opt(nsrc)	1
set tcptrace    [open tcp.tr w]

set opt(seed)   0
set opt(ll)	LL
set opt(ifq)	Queue/DropTail
set opt(qtype)	DropTail
set opt(mac)	Mac/Csma/Ca
set opt(chan)	Channel

set opt(tp)	TCP/Reno
set opt(sink)	TCPSink
set opt(source)	FTP
set opt(cbr)	0
set opt(em)     expo
set opt(eu)     time
set opt(trans)  ""


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