About CMU extension and 802.11 in NS2

Does CMU wireless extension is already integrated in ns2.32 ?
What i find on google is yes , but i was unable to find the file
"sharedmedia.cc" (which has all the parameters like CPThresh_ , CSThresh_
etc. ) in ns-allinone-2.32 folder . According to CMU Project document , all
these variables should be in this file. So, i am confused. If anyone has
any idea , kindly help .

In NS2 , we have Mac/802.11 . does this mac file refers to DCF (distributed
cordination function) . kindly tell me

thanks a lot for ur valuable time.

rgds
sims