Minimum requirements for mirroring Mac/PC in Apple TV I've found plenty of (old) blogs and articles stating that it is/will be possible to mirror the content of a Mac or PC in an Apple TV, but I was unable to find out the current state of this feature.

Official Apple TV 2 store page states that you can "stream from your Mac or PC to the big screen. Enjoy your photos, home videos, and music collection on your HDTV from your Mac or PC over Wi-Fi", but it doesn't say if it's via iTunes, and it seems that it's not talking about Airplay either.

So, for this to be clear, I have some questions:


Is it possible to mirror the content of your screen in an Apple TV?
Is this Airplay?
Does it have limitations of the type of media that you are playing? For example, heavy games in full screen, downloaded videos with subtitles (not from iTunes!), high resolution videos, etc.
Is the quality exactly the same of connecting the MacBook to the TV via HDMI?
Do I need a router for this or will it create a wi-fi network between the notebook and the Apple TV?
What are the minimum requirements for:

the Apple TV (probably ATV2 only);
MacBook (which versions are capable of doing this);
PC (are there any requirements for PC?);
Mac OS (version);
Network.



Please note that I do not wish any information about what a jailbroken device can do.
You can mirror your Mac's screen, Apple calls it AirPlay Mirroring. The section on the Apple TV page you mention actually refers to streaming your "photos, home videos, and music collection", which you can do via iTunes on a Mac or PC.

Requirements

Per Apple's support article on AirPlay Mirroring, to use it you need:


An Apple TV (2nd or 3rd generation) with software update v5.0 or later
And one of these Macs, running OS X 10.8 (Mountain Lion):

iMac (Mid 2011 or newer)
Mac mini (Mid 2011 or newer) 
MacBook Air (Mid 2011 or newer)
MacBook Pro (Early 2011 or newer)



Apple doesn't provide a means for Windows PCs to do AirPlay mirroring, but you might be able to find a third-party solution.

Networking

The Apple TV and the Mac need to be on the same network, one will not be automatically created, but you should be able to create a Wi-Fi network from your Mac and have the Apple TV join it if you don't have a network already set up.

Quality &amp; Performance

The quality is not the same as if you just plugged your Mac in via HDMI, it transcodes your desktop to a video format the Apple TV can read (H.264), since sending uncompressed video would require more bandwidth than any home network could provide. Quality and performance can depend on your Mac and network speed. I haven't tested it thoroughly, but I suspect it wouldn't be appropriate for gaming, as there would be latency issues.