I haven't used Ice Cream Sandwich yet and as far as I know, some phones (Google Nexus perhaps) don't have capacitive or hard buttons. Now as you can see below, there's 4 buttons (this was an image I found while googling).
As far as I know, the buttons are (starting from the left):
- Back button
- Home button
- Menu button
I want to know what the third one is? The one that has overlapping rectangles? My phone has capacitive and I have all the above aside from that one button. I asked this just out of curiosity.