eq.get_players_in_instance

function UpdateLockoutGlobal(global_name,global_value,global_duration)
    local player_list = eq.get_players_in_instance(instance_id);
    -- Lua loop basics:
    -- k = key which is generally the current index of the array
    -- v = value for the current key, in this example it would be the character ID
    for k,v in pairs(player_list) do
        eq.target_global(global_name, global_value, global_duration, 0,v, 0);
    end

end