Well aparently it is another Arma II mod that pits you on teams against other players in Chernarus. Random objectives go to each player and you will find NPC's and weapons crates and ammo. You use cash to buy more weapons as you and your team wonder Chernarus. You already have this game installed if you have the latest BETA patch for Arma II. You simply have to set the filter for "wasteland" and join a game! Also, make sure that your launch options are not set to only launch DayZ if you have it.