This is a list of users that are given read-write access to a service. If the connecting user is in this list then they will be given write access, no matter what the option is set to. The list can include group names using the @group syntax. Note that if a user is in both the read list and the write list then they will be given write access. By design, this parameter will not work with the share in Samba 3.0. read list admin, root, @staff