Syntax:  EXECUTE BUFFER PLSE buffer_name

  Directs LSE to execute LSE commands from a buffer.

  LSE interprets the commands based on the command language that is
  currently established in the editing session.  If a command is
  executed that changes the current command language, the remaining
  commands are interpreted using the new command language setting.  The
  new command language setting will remain in effect when the script
  has finished executing.