Question about WoW PVP...

[xKALECx]

So during the Stress Test I have been playing on non-pvp servers. I've seen some aliance in the horde area, and pvp was taking place. The ones that engaged were flagged with "green" names.

Does this mean that the pvp here was consentual? On the pure pvp servers is the pvp non-consentual being aliance vs horde? This may be a stupid question, but I'm just curious being new to WoW.

[supnoobs]

pvp server:
contested: FFA
horde territory: horde can attack alliance whenever, alliance can only attack horde if they are flaggged pvp( recently came frm contested territory or hit an alliance in their territory [pvp flag lasts 5 minutes])
slliance territory: same

PVE:
green name attained via opening attack upon opposing faction npc.