SET(SCREEN_UPDATE)

 Enables or disables screen updating -- sending characters and cursor
 movements to the screen, so the screen reflects the current internal state
 of any buffer displayed on the screen.  By default, screen updating is
 enabled.

 Syntax

    SET (SCREEN_UPDATE {OFF | ON})

 Parameters

    OFF   Disables screen updates until turned on.

    ON    Enables screen updates, so characters and cursor movement are
          sent to the screen.  This causes VAXTPU to update the screen
          immediately.

 Example

 The following statements turn screen updating off and on; depending on
 what actions occurred while updating is off, the screen may be cleared and
 repainted when you turn updating back on:

    SET (SCREEN_UPDATE, OFF);   ! Turn off updates
           .
           .
    SET (SCREEN_UPDATE, ON);    ! Turn updates back on