sap abap program for Pop a Message to specific SAP users

Is there anyway to popup a window on particular users screens though abap program?

*
* Pop a Message to specific SAP users
*
* How to get a list of all the currently logged on users?
* How to popup an instant message on a user's monitor?
* How to get a specific user's details?
* Usage of 'POPUP_GET_VALUES' function module to get data from user
* without having to write GUI code
*
* Submitted by : SAP Basis, ABAP Programming and Other IMG Stuff
*           
*
REPORT ZPOPUP NO STANDARD PAGE HEADING.
INCLUDE .

DATA:       BEGIN OF USR_TABL OCCURS 0.
               INCLUDE STRUCTURE UINFO.
DATA:       END OF USR_TABL.

DATA:       L_LENGTH        TYPE I,
           T_ABAPLIST      LIKE ABAPLIST OCCURS 0 WITH HEADER LINE,
           BEGIN OF T_USER OCCURS 0,
               COUNTER     TYPE I,
               SELECTION   TYPE C,
               MANDT       LIKE SY-MANDT,
               BNAME       LIKE SY-UNAME,
               NAME_FIRST  LIKE V_ADRP_CP-NAME_FIRST,
               NAME_LAST   LIKE V_ADRP_CP-NAME_LAST,
               DEPARTMENT  LIKE V_ADRP_CP-DEPARTMENT,
               TEL_NUMBER  LIKE V_ADRP_CP-TEL_NUMBER,
           END OF T_USER,
           L_CLIENT        LIKE SY-MANDT,
           L_USERID        LIKE UINFO-BNAME,
           L_OPCODE        TYPE X,
           L_FUNCT_CODE(1) TYPE C,
           L_TEST(200)     TYPE C.

L_OPCODE = 2.
CALL 'ThUsrInfo' ID 'OPCODE' FIELD L_OPCODE
   ID 'TAB' FIELD USR_TABL-*SYS*.

CLEAR T_USER. REFRESH T_USER.
LOOP AT USR_TABL.
   T_USER-MANDT = USR_TABL-MANDT.
   T_USER-BNAME = USR_TABL-BNAME.
   APPEND T_USER.
ENDLOOP.

SORT T_USER.
DELETE ADJACENT DUPLICATES FROM T_USER.
LOOP AT T_USER.
   T_USER-COUNTER = SY-TABIX.
   SELECT V~NAME_FIRST

          V~NAME_LAST
          V~DEPARTMENT
          V~TEL_NUMBER
       INTO (T_USER-NAME_FIRST,
             T_USER-NAME_LAST,
             T_USER-DEPARTMENT,
             T_USER-TEL_NUMBER)
       FROM USR21 AS U
           JOIN V_ADRP_CP AS V
             ON U~PERSNUMBER = V~PERSNUMBER AND
                U~ADDRNUMBER = V~ADDRNUMBER
       WHERE U~BNAME = T_USER-BNAME.
   ENDSELECT.
   MODIFY T_USER.
ENDLOOP.
SORT T_USER BY NAME_LAST NAME_FIRST.
PERFORM DISPLAY_LIST.

TOP-OF-PAGE.
   PERFORM DISPLAY_MENU.
* End of top-of-page

TOP-OF-PAGE DURING LINE-SELECTION.
   PERFORM DISPLAY_MENU.
* End of top-of-page during line-selection


AT LINE-SELECTION.
 IF SY-CUROW = 2.
   IF SY-CUCOL < 19.
       T_USER-SELECTION = 'X'.
       MODIFY T_USER TRANSPORTING SELECTION WHERE SELECTION = ''.
       PERFORM DISPLAY_LIST.
   ELSEIF SY-CUCOL < 36.
       CLEAR T_USER-SELECTION.
       MODIFY T_USER TRANSPORTING SELECTION WHERE SELECTION = 'X'.
       PERFORM DISPLAY_LIST.
   ELSEIF SY-CUCOL < 50.
       PERFORM TRANSFER_SELECTION.
       PERFORM POPUP_MSG.
   ELSEIF SY-CUCOL < 67.
       PERFORM TRANSFER_SELECTION.
       SORT T_USER BY NAME_LAST.
       PERFORM DISPLAY_LIST.
   ELSEIF SY-CUCOL < 81.
       PERFORM TRANSFER_SELECTION.
       SORT T_USER BY NAME_FIRST.
       PERFORM DISPLAY_LIST.
   ELSEIF SY-CUCOL < 93.
       PERFORM TRANSFER_SELECTION.
       SORT T_USER BY MANDT.
       PERFORM DISPLAY_LIST.
   ENDIF.
 ENDIF.
* End of line-selection

*&---------------------------------------------------------------------*
*&      Form  DISPLAY_LIST
*&---------------------------------------------------------------------*
FORM DISPLAY_LIST.
SY-LSIND = 0.
FORMAT COLOR COL_NORMAL INTENSIFIED OFF.
LOOP AT T_USER.
   WRITE: / SY-VLINE, T_USER-SELECTION AS CHECKBOX,
            SY-VLINE, T_USER-MANDT,
            SY-VLINE, T_USER-BNAME,
            SY-VLINE, T_USER-NAME_FIRST(15),
            SY-VLINE, T_USER-NAME_LAST(15),
            SY-VLINE, T_USER-DEPARTMENT(20),
            SY-VLINE, T_USER-TEL_NUMBER(20), SY-VLINE.
   HIDE: T_USER-COUNTER, T_USER-SELECTION.
ENDLOOP.
FORMAT COLOR OFF.
WRITE: /(108) SY-ULINE.
ENDFORM.                    " DISPLAY_LIST

*&---------------------------------------------------------------------*
*&      Form  DISPLAY_MENU
*&---------------------------------------------------------------------*
FORM DISPLAY_MENU.
   FORMAT COLOR COL_HEADING HOTSPOT.
   WRITE:   (91) SY-ULINE,
      / SY-VLINE NO-GAP, (4) ICON_SELECT_ALL NO-GAP,    'Select All',
        SY-VLINE NO-GAP, (4) ICON_DESELECT_ALL NO-GAP,  'Deselect All',
        SY-VLINE NO-GAP, (4) ICON_SHORT_MESSAGE NO-GAP, 'Send Popup',
        SY-VLINE NO-GAP, (4) ICON_SORT_UP NO-GAP, 'Last Name' NO-GAP,
        SY-VLINE NO-GAP, (4) ICON_SORT_UP NO-GAP, 'First Name' NO-GAP,
        SY-VLINE NO-GAP, (4) ICON_SORT_UP NO-GAP, 'Client' NO-GAP,
        SY-VLINE,
      /(91) SY-ULINE,
      /(108) SY-ULINE.
  FORMAT HOTSPOT OFF.

  WRITE: / SY-VLINE, ' ',
           SY-VLINE, 'Cli',
           SY-VLINE, 'User        ',
           SY-VLINE, 'First Name     ',
           SY-VLINE, 'Last Name      ',
           SY-VLINE, 'Department          ',
           SY-VLINE, 'Telephone           ',
           SY-VLINE,
         /(108) SY-ULINE.
   FORMAT COLOR OFF.
ENDFORM.                    " DISPLAY_MENU

*&---------------------------------------------------------------------*
*&      Form  TRANSFER_SELECTION
*&---------------------------------------------------------------------*
FORM TRANSFER_SELECTION.
   DO.
       READ LINE SY-INDEX FIELD VALUE T_USER-SELECTION.
       IF SY-SUBRC <> 0.
           EXIT.
       ENDIF.
       MODIFY T_USER TRANSPORTING SELECTION
              WHERE COUNTER = T_USER-COUNTER.
   ENDDO.
   CLEAR T_USER.
ENDFORM.                    " TRANSFER_SELECTION

*&---------------------------------------------------------------------*
*&      Form  POPUP_MSG
*&---------------------------------------------------------------------*
FORM POPUP_MSG.
   DATA: L_MSG      LIKE SM04DIC-POPUPMSG VALUE 'Experimental Message',
         L_LEN      TYPE I,
         L_RET      TYPE C.

   LOOP AT T_USER WHERE SELECTION = 'X'.
       PERFORM GET_MESSAGE CHANGING L_MSG L_RET.
       EXIT.
   ENDLOOP.
   IF L_RET = 'A'.            "User cancelled the message
       EXIT.
   ENDIF.
*   Get the message text
   L_LEN = STRLEN( L_MSG ).
   LOOP AT T_USER WHERE SELECTION = 'X'.
           CALL FUNCTION 'TH_POPUP'
                EXPORTING
                     CLIENT         = T_USER-MANDT
                     USER           = T_USER-BNAME
                     MESSAGE        = L_MSG
                     MESSAGE_LEN    = L_LENGTH
*                     CUT_BLANKS     = ' '
                EXCEPTIONS
                     USER_NOT_FOUND = 1
                     OTHERS         = 2.
           IF SY-SUBRC <> 0.
               WRITE: 'User ', T_USER-BNAME, 'not found.'.
           ENDIF.
   ENDLOOP.
   IF SY-SUBRC <> 0.
*       Big error! No user has been selected.
       MESSAGE ID 'AT' TYPE 'E' NUMBER '315' WITH
             'No user selected!'.
       EXIT.
   ENDIF.
ENDFORM.                    " POPUP_MSG

*&---------------------------------------------------------------------*
*&      Form  GET_MESSAGE
*&---------------------------------------------------------------------*
FORM GET_MESSAGE CHANGING P_L_MSG LIKE SM04DIC-POPUPMSG
                         P_RETURNCODE TYPE C.
DATA: BEGIN OF FIELDS OCCURS 1.
       INCLUDE STRUCTURE SVAL.
DATA: END OF FIELDS,
     RETURNCODE TYPE C.

   FIELDS-TABNAME = 'SM04DIC'.
   FIELDS-FIELDNAME = 'POPUPMSG'.
   FIELDS-FIELDTEXT = 'Message :'.
   CONCATENATE ' - Msg from' SY-UNAME '.' INTO FIELDS-VALUE SEPARATED
           BY ' '.
   APPEND FIELDS.

   CALL FUNCTION 'POPUP_GET_VALUES'
       EXPORTING POPUP_TITLE     = 'Supply the popup message'

       IMPORTING RETURNCODE      = P_RETURNCODE
       TABLES    FIELDS          = FIELDS.

   IF P_RETURNCODE = 'A'.
       EXIT.
   ELSE.
       READ TABLE FIELDS INDEX 1.
       P_L_MSG = FIELDS-VALUE.
   ENDIF.
ENDFORM.                    " GET_MESSAGE

*-- End of Program