Q: does mountain lion support airplay mirroring

I am trying to get netflix on apple TV and have had 2 stories aout airplay. 1 is you cannot use airplay from the imac outside the itune app if you have a core dual processor? Secondly you need mountain lion to use airplay outside of itunes. Reason being I am trying to get netflix onto the big screen using apple tv and am in an area netflix is not in yet. Before i go to mountain lion from snow leopard i wanted to ensure i could do it on the imac i have. otherwise the choice is a cable or a new imac!!!