Q: Why dont I get AirPlay on my late 2011 MacBook Pro. Software  Mac OS X Lion 10.7.5 (11G63b),Graphics  Intel HD Graphics 3000 384 MB

About AirPlay and Airplay Mirroring

AirPlay Mirroring requires a second-generation Apple TV or later, and is supported on the following Mac models: iMac (Mid 2011 or newer), Mac mini (Mid 2011 or newer), MacBook Air (Mid 2011 or newer), and MacBook Pro (Early 2011 or newer). For non-qualifying Macs you can try using Air Parrot.

Several Apple Articles Regarding AirPlay

Apple TV (2nd and 3rd gen)- How to use AirPlay Mirroring

How to set up and configure AirPort Express for AirPlay and iTunes

iTunes- Troubleshooting AirPlay and AirPlay Mirroring

iTunes- Using AirPlay

Apple TV (2nd and 3rd gen)- Understanding AirPlay settings

About AirPlay Mirroring in OS X Mountain Lion

iTunes 10- About playing music with AirPlay

Troubleshooting AirPlay and AirPlay Mirroring

Using AirPlay

Thanks to the $15 Beamer, AirPlay streaming is still possible on Macs  that do not support Airplay and mirroring.

Other solutions are the Air Parrot, StreamToMe, and AirServer.

Airplay is not supported in Lion (10.7.5).  It requires 10.8 or later.  There are some issues with Airplay under 10.9.2.   Not sure if 10.9.3 fixes them.

StreamToMe, and AirServer

are the direct developer links.  I do not recommend linking to Macupdate, without the disclaimer that MacUpdate advertises MacKeeper, the worst Malware to date for Macs, which should not be downloaded at any cost, as only these third party uninstallation directions work for it:

http://discussions.apple.com/docs/DOC-3036