Screen-active and screen-invisible

Hi all,
What is the difference between screen-active and screen-invisible as both are used in making the selection screen parameter invisible.
Regards,
Sandeep

Hi all,
i have worked with both screen-active and screen-invisible. Below are the sample code where both of them are giving the same output. So i dont understand how the two can be used differently.
Using Screen-active
REPORT zdemo_test.
PARAMETERS: p_pernr1 TYPE pernr_d,
p_pernr2 TYPE pernr_d.
PARAMETERS: rd1 RADIOBUTTON GROUP g1 DEFAULT 'X' USER-COMMAND abc,
rd2 RADIOBUTTON GROUP g1 .
AT SELECTION-SCREEN OUTPUT.
IF rd1 EQ 'X'.
LOOP AT SCREEN.
IF screen-name = 'P_PERNR1'.
screen-active = '0'.
MODIFY SCREEN.
ENDIF.
ENDLOOP.
ELSEIF rd2 EQ 'X'.
LOOP AT SCREEN.
IF screen-name = 'P_PERNR2'.
screen-active = '0'.
MODIFY SCREEN.
ENDIF.
ENDLOOP.
ENDIF.
Using screen-invisible and screen-input
REPORT zdemo_test.
PARAMETERS: p_pernr1 TYPE pernr_d,
p_pernr2 TYPE pernr_d.
PARAMETERS: rd1 RADIOBUTTON GROUP g1 DEFAULT 'X' USER-COMMAND abc,
rd2 RADIOBUTTON GROUP g1 .
AT SELECTION-SCREEN OUTPUT.
IF rd1 EQ 'X'.
LOOP AT SCREEN.
IF screen-name = 'P_PERNR1'.
screen-invisible = '1'.
screen-input = '0'.
MODIFY SCREEN.
ENDIF.
ENDLOOP.
ELSEIF rd2 EQ 'X'.
LOOP AT SCREEN.
IF screen-name = 'P_PERNR2'.
screen-invisible = '1'.
screen-input = '0'.
MODIFY SCREEN.
ENDIF.
ENDLOOP.
ENDIF.

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Hello Guys...
Previous code I have given is modify by this but same problem..
I have dubug the program and trace it. it's will not goes on Selection Screen
on Each back button the event occurs which is user-command 2000.
I have Created a program using Selection-Screen 1000. and Screen 2000.
At Selection-Screen I have written code
Start-of-selection.
ok_code = sy-ucomm.
CASE ok_code.
WHEN 'BACK'.
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