SET(ERASE_UNMODIFIABLE)

    Controls whether VAXTPU erases unmodifiable records in response to
    built-ins that delete lines from a buffer.  For example, ERASE_LINE
    only deletes an unmodifiable record if ERASE_UNMODIFIABLE is turned on.
    If ERASE_UNMODIFIABLE is turned off when ERASE_LINE or a similar
    built-in encounters an unmodifiable record, the built-in returns an
    error and does not delete the record.

    SET (ERASE_UNMODIFIABLE) optionally returns an integer (0 or 1)
    indicating whether ERASE_UNMODIFIABLE was turned on before the current
    call was executed.  This makes it easier to return to the previous
    setting later in the program.

 Syntax

    [previous_erase_setting] := SET (ERASE_UNMODIFIABLE, buffer,
                                     {ON | OFF})

 Parameters

     ERASE_UNMODIFIABLE     A keyword indicating that the SET built-in is
                            being used to control whether unmodifiable
                            records are deleted in response to built-ins
                            that erase lines in a buffer.

     buffer                 The buffer for which you want to turn on or
                            turn off erasing of unmodifiable records.

     ON                     Enables erasing of unmodifiable records.

     OFF                    Disables erasing of unmodifiable records.

     previous_erase_setting An integer (1 or 0) indicating whether
                            ERASE_UNMODIFIABLE was turned on before the
                            current call was executed.

 Example

    The following statement turns off erasing of unmodifiable records in
    the current buffer and returns the previous setting of
    ERASE_UNMODIFIABLE:

    old_setting := SET (ERASE_UNMODIFIABLE, CURRENT_BUFFER, OFF);

 Related Topics

    GET_INFO(BUFFER_VARIABLE)          GET_INFO(MARKER_VARIABLE)
    GET_INFO(WINDOW_VARIABLE)          SET(DISPLAY_VALUE)
    SET(RECORD_ATTRIBUTE)              SET(MODIFIABLE)