let me explain this for you in simpler terms
1) you have to get their wii-code and name of their hardrive.
2) this is used so you can wii-mail them (if you have your own code and wii-mail set up.)
3) no you can only check if their online on wi-fi games like Mario Strikers charged, fifa 08, madden 08, and PBR.
does that answer you questions Dean? oh and please add to my reputation.