Ill make this as simple as i can. I have a vita, my friend is going to buy a PS4, we will have different accounts for our respective devices. With that in mind can i do the following: 1) Use my Vita as a controller for his PS4 if we played a 2player game? 2) Do we have to share the same account to do remote play? 3) Will i be able to use my vita to interact with him on his PS4? (live messaging / See what he's playing) 4) Broadcast my Vita game onto the TV using his PS4? Thanks in advance.