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  1.                                   already displayed at that line,
  2.                                   it and all subsequent elements
  3.                                   will be moved up the stack to
  4.                                   make room for the new element.
  5.                                   It is not possible to overwrite
  6.                                   an element.
  7.  
  8.              MODIFY ELEMENT ..... Allows the user to modify the
  9.                                   parameters or the file name of
  10.                                   the element.  If a file name is
  11.                                   changed, this causes the program
  12.                                   to re-evaluate all file elements
  13.                                   upon exiting.  A full explaina-
  14.                                   tion of this follows later.
  15.  
  16.              DELETE ELEMENT ..... Deletes the element currently
  17.                                   displayed.  If there are sub-
  18.                                   sequent elements, they will be
  19.                                   moved down the stack. 
  20.  
  21.          LIST NETWORK ....... Lists the entire network on
  22.                                   the screen.  The user will be
  23.                                   asked if a hard copy of the
  24.                                   display is desired.  Any reply
  25.                                   other than "Y" will send the
  26.                                   program back to the editor at
  27.                                   line one.  The same occurs
  28.                                   after the copying is completed,
  29.                                   if requested.
  30.  
  31.          SAVE NETWORK ....... Enables the user to save the
  32.                                   network topology on disk.  The
  33.                                   user will be asked to supply a
  34.                                   file name.  If it is decided
  35.                                   at this point not to save the
  36.                                   network, simply hit RETURN and
  37.                                   the operation will be cancelled.
  38.  
  39.          NEW NETWORK ........ Deletes the network currently
  40.                                   in memory, then asks the user
  41.                                   for a subsequent file name for
  42.                                   the new network.  The procedure
  43.                                   at this point is the same as
  44.                                   descibed at the beginning of
  45.                                   this chapter for entering the
  46.                                   editor.
  47.  
  48.          EDIT DATA FILES .... Allows access to the Data File
  49.                                   Editor.  See the following chap-
  50.                   ter concerning this function
  51.                   for details.
  52.  
  53.  
  54.  
  55.  
  56.                                      - 3 -
  57.