Invoking A popup Only Once.

Hi Guys/Dolls
I've got the following piece of code but it's not behaving as I expect it to - Can any of you shed some light on it for me.
I have an executable program but prior to the main selection screen being displayed I'm asking the user to check to see if they have done the pre-work as required, done via the use of TR_POPUP_TO_CONFIRM.
If they select Yes the program carries on as normal but when they press the back arrow key (i.e. the big green one on SAP) the popup appears again I don't want it to as they have already answered "Yes" to the pre-work question. Can any of you gurus shed any light on this as I am literally going around in circles.
REPORT zh055rep LINE-SIZE 132 LINE-COUNT 65 NO STANDARD PAGE HEADING.
INITIALIZATION.
PERFORM prework_check.
... remainder of program
FORM prework_check.
Declare a static variable to show us how many times we have invoked the application.
STATICS app_invokation TYPE i.
Application invoked thus increment the counter.
app_invokation = app_invokation + 1.
IF app_invokation = 1.
Check to see if the user has done his/her pre-work prior to proceeding.
    CALL FUNCTION 'TR_POPUP_TO_CONFIRM'
      EXPORTING
        iv_titlebar           = 'Pre Work Warning'
        iv_text_question      = ' Have you done your pre-work? check documentation'
        iv_text_button1       = 'Yes'
        iv_text_button2       = 'No'
        iv_with_cancel_button = 'X'
      IMPORTING
        ev_answer             = v_ev_answer.
    IF the answer is No or the Cancel button haul his/her *** out of the program.
      IF v_ev_answer = '2' OR v_ev_answer = 'A'.
        LEAVE.
      ENDIF.
ENDIF.
ENDFORM.                    " PREWORK_CHECK
Any help would be appreciated.
Many thanks in advance.
Raj

Hi!
You can use the global sap memory to this, but the variable here are living only until you are within the transaction.
IMPORT app_invokation FROM MEMORY ID 'ZZMY_APP_INVOKATION'.
IF app_invokation IS INITIAL.
MOVE 'X' TO app_invokation.
EXPORT app_invokation TO MEMORY ID 'ZZMY_APP_INVOKATION'.
ENDIF.
If it is not enough, you have to store it in a Z-table, for each user maybe...
Regards
Tamá

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