Save Named Options...

  Choose Save Named Options...  to save the current options
  with a new or different file name.  DECterm displays a dialog
  box.

  The dialog box prompts you for the name of the file you
  want to use to save your options.  The file list box displays
  the names of any files in the current directory that contain
  selected options.  By default, these files have the type DAT.

  To use a file name that is not listed, enter the name of that
  file in the Selection text entry box and click on the OK button.