MultiCharacter System

Hello there.I've seen Multi Character system in many servers,..you can Create and Switch characters In Game.I can script and all that stuff,but the only thing I don't know is 'How to set & save Player's Info'.

Like,

PlayerInfo[playerid2]?? Seems strange

PlayerInfo2[playerid] Even Strange

Ed Cetera

Can anyone explain that to me below?

Thanks!