hold command
    (A) Function
        Fixing a facility value. 
    (B) Format
        hold  <facility>
    (C) Parameter
        <facility>
         Designate a facility you prevent from being written 
         in the execution of a simulation. 
    (D) Notes
        With the set/memset/memclr commands, you can change a facility value.
        If you fix a facility value of a data terminal or an instruction 
        terminal, execute the set command to the facility before the issue 
        of the hold command. 
    (E) Related items
        set command
        release command