Describe: ns2 code for beginners

File list(Click to check if it's the file you need, and recomment it at the bottom):
  AllAssignment\Aakash Gautam 20095067\Aakash Gautam 20095067\simple-wireless.tcl
  .............\......................\......................\sliding window.tcl
  .............\......................\......................\Stop_Wait\A1-stop-n-wait.nam
  .............\......................\......................\.........\A1-stop-n-wait.tr
  .............\......................\......................\.........\delivery_ratio.awk
  .............\......................\......................\.........\stop_wait.tcl
  .............\......................\......................\topology.tcl
  .............\......................\......................\wired_cum_wireless_mob_ip.tcl
  .............\......Srivastava20095094\AakashSrivastava20095094\simple-wireless.tcl
  .............\........................\........................\sliding window.tcl
  .............\........................\........................\stop and wait.tar.zip
  .............\........................\........................\wireless3.tcl
  .............\.BHIMANYU_SETH_20094019\FIRSTNAME_LASTNAME_REGNO\Stop_Wait\delivery_ratio.awk
  .............\.......................\........................\.........\stop_wait.tcl
  .............\.......................\........................\.........\A1-stop-n-wait.tr
  .............\.......................\........................\.........\A1-stop-n-wait.nam
  .............\.......................\........................\simple-wireless.tcl
  .............\.......................\........................\wired_cum_wireless_mob_ip.tcl
  .............\.......................\........................\topology.tcl
  .............\.......................\........................\sliding window.tcl
  .............\.bhishek Tayal 20095119\simple-wireless.tcl
  .............\.......................\sliding window.tcl
  .............\.......................\stop and wait.tar.zip
  .............\.......................\wireless3.tcl
  .............\.......................\stop and wait\deliveryratio.awk
  .............\.......................\.............\ns-simple.tcl
  .............\.......................\.............\simple.tr
  .............\.......sh_srivastava_20094090\Abhishesh_srivastava_20094090\Stop_Wait\delivery_ratio.awk
  .............\.............................\.............................\.........\stop_wait.tcl
  .............\.............................\.............................\.........\A1-stop-n-wait.tr
  .............\.............................\.............................\.........\A1-stop-n-wait.nam
  .............\.............................\.............................\simple-wireless.tcl
  .............\.............................\.............................\wired_cum_wireless_mob_ip.tcl
  .............\.............................\.............................\topology.tcl
  .............\.............................\.............................\sliding window.tcl
  .............\.darshSrivastava20094046\simple-wireless.tcl
  .............\........................\sliding window.tcl
  .............\........................\stop and wait.tar.zip
  .............\........................\wireless3.tcl
  .............\........................\stop and wait\deliveryratio.awk
  .............\........................\.............\ns-simple.tcl
  .............\........................\.............\simple.tr
  .............\..ityaSingh20093010\StopAndWait.zip
  .............\...................\simple-wireless.tcl
  .............\...................\wireless3.tcl
  .............\...................\sliding window.tcl
  .............\...................\StopAndWait\stop_and_wait_protocol.tcl
  .............\...................\...........\delivery_ratio.awk
  .............\...................\...........\out.nam
  .............\...................\...........\out.tr
  .............\.kash_Rai_20094014\Akash_Rai_20094014\Stop_Wait\A1-stop-n-wait.nam
  .............\..................\..................\.........\A1-stop-n-wait.tr
  .............\..................\..................\.........\delivery_ratio.awk
  .............\..................\..................\.........\stop_wait.tcl
  .............\..................\..................\simple-wireless.tcl
  .............\..................\..................\sliding window.tcl
  .............\..................\..................\topology.tcl
  .............\..................\..................\wired_cum_wireless_mob_ip.tcl
  .............\.....deep20098009\simple-wireless.tcl
  .............\.................\sliding window.tcl
  .............\.................\stop and wait.tar.zip
  .............\.................\wireless3.tcl
  .............\..shatSinghal20094108\AkshatSinghal20094108\Stop and Wait.zip
  .............\.....................\.....................\simple wireless.tcl
  .............\.....................\.....................\sliding window.tcl
  .............\.....................\.....................\wired_cum_wireless_mobile_IP.tcl
  .............\.KSHAY_VERMA_20094011\FIRSTNAME_LASTNAME_REGNO\Stop_Wait\A1-stop-n-wait.nam
  .............\.....................\........................\.........\A1-stop-n-wait.tr
  .............\.....................\........................\.........\stop_wait.tcl
  .............\.....................\........................\.........\delivery_ratio.awk
  .............\.....................\........................\wireless3-out.nam
  .............\.....................\........................\out.nam
  .............\.....................\........................\sliding window.tcl
  .............\.....................\........................\topology.tcl
  .............\.....................\........................\simple-wireless.tcl
  .............\.....................\........................\simple.tr
  .............\.....................\........................\wireless3-out.tr
  .............\.....................\........................\wired_cum_wireless_mob_ip.tcl
  .............\.lankrita_Pandey_20094004\Alankrita_Pandey_20094004\wireless.tcl
  .............\.........................\.........................\wired_n_wireless_mobile_ip.tcl
  .............\.........................\.........................\stop_and_wait_protocol.tcl
  .............\.mol_Sharma_20094052\Amol_Sharma_20094052\Stop_Wait\delivery_ratio.awk
  .............\....................\....................\.........\mystop_wait.tcl
  .............\....................\....................\.........\A1-stop-n-wait.tr
  .............\....................\....................\.........\A1-stop-n-wait.nam
  .............\....................\....................\simple-wireless.tcl
  .............\....................\....................\wired_cum_wireless_mob_ip.tcl
  .............\....................\....................\topology.tcl
  .............\....................\....................\sliding window.tcl
  .............\.namika_Gupta20094131\Anamika_Gupta20094131\wired_cum_wireless_mob_ip.tcl
  .............\.....................\.....................\stopnwait.tcl
  .............\.....................\.....................\simple-wireless.tcl
  .............\..ilKumarArya20094051\AnilKumarArya20094051\Stop and Wait.zip
  .............\.....................\.....................\simple_wireless.tcl
  .............\.....................\.....................\sliding_window.tcl
  .............\.....................\.....................\wired_cum_wireless_mobile_IP.tcl
  .............\..ju_Khatri 20097001(cse 01)\FIRSTNAME_LASTNAME_REGNO\Stop_Wait\delivery_ratio.awk
  .............\............................\........................\.........\stop_wait.tcl
  .............\............................\........................\.........\A1-stop-n-wait.tr
  .............\............................\........................\.........\A1-stop-n-wait.nam