You first complete a video interview that you tape yourself and it allows you to re-do if you need to, then you do an interview with your future manager, and the person they report to
I applied online. I interviewed at Comcast in Feb 2012
Interview
met with local sales manager. they asked questions like: what's your greatest weakness? and how would you deal with an irate client or advertiser? you may also meet with other account executives and other people at your level. of course, your direct supervisor will also be there. it was in a conference room with plenty of chairs.