REPORT  zf4_applicationserver.

**Parameters**

PARAMETERS: p_file TYPE rlgrap-filename.

***AT Selection-Screen*******

AT SELECTION-SCREEN ON  VALUE-REQUEST FOR p_file.

***Function  module for F4 help from Application  server

  CALL FUNCTION '/SAPDMC/LSM_F4_SERVER_FILE'
* EXPORTING
*   DIRECTORY              = ' '
*   FILEMASK               = ' '
   IMPORTING
   serverfile             =  p_file
   EXCEPTIONS
   canceled_by_user       = 1
   OTHERS                 = 2
            .
  IF sy-subrc = 0.
    MESSAGE 'Successful'  type 'I'.
  ENDIF.

Execute the program. 

Press F4 . The following pop-up screen would appear. 

Let us select a file from the given list (see the screen-shot above). 

For our testing purpose, we have issued a success message if the F4 help is successful. Following is the success message: