The MODIFY CLASS command changes the characteristics of one or
    more classes. You can alter the following characteristics:

    o  The name of the class.

    o  The access to the class (READ_ONLY or NOREAD_ONLY). You cannot
       change the contents, the name, or the remark of a class that
       has been set to READ_ONLY.

    o  The creation remark that is associated with the class.

    Use the SHOW CLASS command to display class characteristics.