LOCK TABLE statement

Hi, all

   Is the following sentence true ?

   * LOCK TABLE statement don't allows read access to locked tables by
     the other users.
     If another user try to SELECT a locked table, he must attend
     until the locked table is released.

   I have heard about another syntax of LOCK TABLE that allows read access
   to locked tables, on v6.3.2.
   Is it true or I've dream ?
                                                     Thanks, Jose'