LSE provides two ways to issue commands:   keypad  mode  and  command
  line  mode.   When you invoke LSE, you are in keypad mode.  In keypad
  mode, text that you type is inserted into a buffer.  Keypad,  cursor,
  and  control keys execute LSE functions.  Thus, you can press keys to
  perform editing functions rather than typing commands on the  command
  line.

  LSE provides two keypads:  EDT keypad and EVE keypad.  The default is
  the  EDT  keypad.  You can use the SET MODE KEYPAD command to get the
  EVE keypad.  The EDT key bindings are used in  the  examples  in  the
  manual.

  Some LSE commands are not bound to keys.   Therefore,  they  must  be
  entered  in  command  line mode.  There are two command line prompts:
  LSE Command> and LSE>.

  The LSE Command> prompt will process one command.  After that command
  is  processed, LSE returns to keypad mode.  There are two ways to get
  the LSE  command>  prompt:   pressing  the  DO  key  or  COMMAND  key
  (PF1-KP7).  LSE will place the LSE Command> prompt near the bottom of
  the screen.

  Alternatively, the LSE> prompt allows you to issue as  many  commands
  as  you  want.   To  get the LSE> prompt, you press CTRL/Z.  LSE will
  place the LSE> prompt near the bottom of the screen.   To  return  to
  keypad  mode,  you  can  press  CTRL/Z  again  or  issue the CONTINUE
  command.