USER_COMMAND logic

Question

I have below code
{MODULE user_command_0100 INPUT.
  DATA : ok_code LIKE sy-ucomm,
         save_ok LIKE ok_code,
         output LIKE ok_code.
  ok_code = sy-ucomm.
  save_ok = ok_code.
  CLEAR ok_code.
  CASE save_ok.
    WHEN '&F03' OR '&F15' OR '&F12'.
      LEAVE PROGRAM.
    WHEN 'DISPLAY'.
      LEAVE TO SCREEN 100.
    WHEN OTHERS.
      output = save_ok.
  ENDCASE.
ENDMODULE.                 " USER_COMMAND_0100  INPUT}
In the above code I want to also add command for following functions
1) find 2) print 3) First Page 4) Next page 5) last page
what is the code to be written for these functions?  is there a list of these functions like I have written for 'LEAVE PROGRAM'.
Regards,
Santosh

Answer 1

But I am not getting how to add it to the code.
should i do like this ???
CASE save_ok.
    WHEN '&F03' OR '&F15' OR '&F12'.
      LEAVE PROGRAM.
    WHEN 'DISPLAY'.
      LEAVE TO SCREEN 100.
    WHEN '%SC'.
       FIND.
     WHEN '&RNT'.
        Print.
    WHEN OTHERS.
      output = save_ok.
  ENDCASE.