# File lib/chef/provider/group/windows.rb, line 58
        def manage_group
          if @new_resource.append
            begin
              #ERROR_MEMBER_IN_ALIAS if a member already exists in the group
              @net_group.local_add_members(@new_resource.members)
            rescue
              members = @new_resource.members + @current_resource.members
              @net_group.local_set_members(members.uniq)
            end
          else
            @net_group.local_set_members(@new_resource.members)
          end
        end