They belong to Class "Simulator" ?

[Frank Chu <frankchu_ns@yahoo.com>]

In the following example, two questions:

  1) "ns_duplex" is a method of class "Simulator" ? 
all methods without explicitely indicating its class
or object in a procedure means its class is
"Simulator" ?  But I can't find "ns_duplex" method
under the class "Simulator" in Antonie's class
hierachy homepage.

  2) The same as "lindex" below, and the "OpenTrace",
"trace" in some other code.  Where can I find them ?

  Thanks so much!

Frank

---
proc create_testnet1 { } {

        global s1 s2 r1 k1
        set s1 [ns node]
        set s2 [ns node]
        set r1 [ns node]
        set k1 [ns node]

        ns_duplex $s1 $r1 10Mb 5ms drop-tail
        ns_duplex $s2 $r1 10Mb 5ms drop-tail
        set L [ns_duplex $r1 $k1 1.5Mb 100ms
drop-tail]
        [lindex $L 0] set queue-limit 23
        [lindex $L 1] set queue-limit 23
}         

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