SET(MODIFIED)

  Turns on or turns off DECTPU'S internal marker indicating that the
  specified buffer has been modified.

  Syntax

     SET (MODIFIED, buffer, {OFF | ON})

  Parameters

     buffer               The buffer whose marker you want to set.

     OFF                  A keyword that turns off DECTPU's internal
                          modified-status marker.

     ON                   A keyword that turns on DECTPU's internal
                          modified-status marker.