Syntax:  SAVE FILE file_spec

  Writes the current buffer to the specified file.

  LSE defaults to the current buffer's output file if you specified one
  with the SET BUFFER OUTPUT FILE command.  If an output file is not
  present, LSE defaults to the current buffer's input file (specified
  when you enter an OPEN FILE command).  If LSE cannot find an input or
  output file, it prompts you for a file name.

  LSE displays an informational message or prompts for information
  before writing the buffer under any of the following conditions:

                o  If you have not specified an input or output file name

                o  If you have not modified the buffer (not made any
                   changes during your editing session)

                o  If the buffer's close status is read-only

                o  If the output directory is read-only

  You may use this command and supply a file name at any time while you
  are in an editing session, thereby creating a new file that contains
  the output up to that point in your editing session.  However, using
  this command to write the data to a different file does not change
  the file association of the buffer; that is, LSE still creates a new
  version of the file with the same name as that associated with the
  buffer when you exit from that editing session or subsequently use
  this command without specifying a file name.  To change the output
  file association, use the SET BUFFER OUTPUT FILE command.