With Arma 2 came along the option for players to cheat by holding left shift and the numpad minus key. This can be abused as it is a backdoor to complete the backpack dupe, for which most servers have a fix for. To fix this, it's very simple: 1. Open up dayz_spaceInterrupt.sqf 2. Find the following:  _shift = _this select 2; _ctrl = _this select 3; _alt = _this select 4; And paste the following below: if (_shift) then { if(_dikCode == 0x4A) then { execVM "PAT