Hi, I'm interested to play Guild War , as I know, there are few Guild War games:

Guild Wars
Guild Wars Factions
Guild Wars Nightfall
Guild Wars Eye of the North
Guild War 2 (Probably year 2012)

If I intend to play Guild Wars Eye of The North:

1) Do I need to purchase all the previous version in order to play this current version?
2) Do all the player different from game to game? Or they are all link together?

Kindly enlighten me, thx ^^