An NFS server can specify, for each filesystem shared, which
client hosts or netgroups may mount that filesystem and whether
each specified client has read-write or
read-only permission when accessing that filesystem:
``Read-write'' means users on the client machine may write to the
filesystem.
``Read-only'' means users on the client machine may not write to the
filesystem.
Read-write and read-only permissions are usually granted in
combinations; for example, a calendar server may be viewed by
many read-only clients, but only a few read-write clients have
schedule permissions. The Filesystem Manager allows you to
specify permissions to All systems,
Selected systems, or None in these
combinations: