understanding the wimax test file

I have just patched my ns2.31 with wimax module by NIST and simulated the tcl file:

http://code.google.com/p/ns-2-31wimaxrelay/source/browse/tcl/wimax/wimax1.tcl?spec=svn6&r=6

Being a novice to ns2, I din’t actually get the code properly. Can anybody comment the code in a descriptive way ? I urgently need some help.

Your help will be highly appreciated.