Currently Being ModeratedMar 20, 2013 5:47 AM (in response to mohd89)
See feature specific requirements at that link.
You need to be running Mountain Lion on acceptable (to Apple) hardware
None of my 2010 or earlier Macs can Airplay.
You might want to try Airparrot which is a software attempt to Airplay. Demo it first to see if it works for you. (User comments are varied).