The Live Community Screening (LCS) is where all of this goes down - and BD-Live is a requirement as is the BD disc of the movie that is getting the LCS treatment. In the case of Terminator Salvation, that's a LCS showing in December that will be joined by the movie's director, McG (Charlie's Angels 1 and 2 for those not in the know). Viewers will be watching the movie along with McG while asking him questions about the film - all at the same time. What that means and how the LCS is different this time than all the others that have occurred before - we'll get to in a minute. First, let's explain what you have to do in order to be able to become a part of the LCS.
You have to have the BD version of Terminator Salvation, duh, but also your Blu-ray player has to be BD-Live enabled (meaning that it has a wired or wireless connection for accessing your home network/broadband connection). You also have had to register with Warner Bros. BD-Live, but anybody who's been watching Warner BD's should know to have done this already.