Can I use AirPort to link my laptop to my TV?

I've got a Sony flatscreen TV with HDMI ports. I'm wondering if I can use an AirPort unit to connect my laptop to it wirelessly, effectively making it a really big monitor. Or, for that fact, my Apple TV unit. Any pointers would be most welcome!
Thanks,
Eric

In this scenario, you will want to take advantage of OS X's Internet Sharing feature. In this particular case, you will be sharing your iMac's Ethernet connection to the Internet modem out of the iMac built-in wireless (AirPort Card).
The following would be the basic steps to configure your iMac for Internet Sharing:
To setup for Internet Sharing (Wired to Wireless):
Setup the Network
Cable Modem > (Ethernet cable) > \[Ethernet port] Mac_#1 > (wireless) > PC Laptop
Enable Software Firewall - iMac
System Preferences > Security > Firewall
o Block all incoming connections (enabled)
Enable Internet Sharing - iMac
System Preferences > Sharing
o Select "Internet Sharing" from the options in the left column
o Share your connection from: Built-in Ethernet
o To computers using: AirPort (checked) (Note: Uncheck all other entries in the list.)
AirPort Options...
o Network Name: <anything you want>
o Channel: Automatic
o Enable encryption (using WEP) (optional)
o Password: (optional)
o Confirm Password: (optional)
o WEP Key Length: (optional)
o Click OK
o Select "Internet Sharing" again
o Click "Start" to start Internet Sharing
o Click Start

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