Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  Messages  HEIGHTDIFF
 desired height of specified_height is not allowed, height is set to
 actual_height

    Facility: DEBUG, VMS Debugger

    Explanation: The device specified by DBG$OUTPUT had a screen
    height that wasn't in the range of 18-100.

    User Action: Use SHOW TERMINAL command and verify that the
    terminal height is correct, it is in the range 18-100, and is
    pointing to a valid terminal type.
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