What exactly is happening in the code mentioned?????

Hi all,
I want to know the working of the below code:
The below code is the WHEN_BUTTON_PRESSED Trigger for the ENTER_QUERY (Push Button):
DECLARE
IT_ID1 ITEM;
IT_ID2 ITEM;
IT_ID3 ITEM;
BEGIN
IT_ID1 := FIND_ITEM('BUTTON.EN_QUERY');
IT_ID2 := FIND_ITEM('BUTTON.CA_QUERY');
IT_ID3 := FIND_ITEM('BUTTON.EX_QUERY');
SET_ITEM_PROPERTY(IT_ID3,ENABLED,PROPERTY_TRUE);
if :system.mode<>'ENTER-QUERY' THEN
   set_item_property (it_id1,label,'CANCEL QUERY');
   GO_BLOCK(GET_APPLICATION_PROPERTY(CURRENT_FORM_NAME));
   CLEAR_BLOCK(NO_VALIDATE);
   ENTER_QUERY;
set_item_property (it_id1,label,'ENTER QUERY');
ELSE
EXIT_FORM;
END IF;
END;
Can You please tell me what exactly is happening in the above code?
I want to know the working of it. Help me plz.
Thank You.
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
Oracle Forms 6i.

what does if :system.mode<>'ENTER-QUERY' THEN mean??
SYSTEM.MODE indicates whether the form is in Normal, Enter Query, or Fetch Processing mode. The value is always a character string.
and what does GO_BLOCK(GET_APPLICATION_PROPERTY(CURRENT_FORM_NAME)); do?
GET_APPLICATION_PROPERTY Returns information about the current Oracle Forms application. CURRENT_FORM_NAME Returns the name of the current form as indicated by the form module Name property.
GO_BLOCK navigates to an indicated block. If the target block is non-enterable, an error occurs.
As per the code, After i press the button, the label ENTER QUERY should become CANCEL QUERY, (that is when system is in ENTER_QUERY mode) .
So when in the system is in ENTER_QUERY mode, it must display CANCEL QUERY, Right??
in your post, you also said..
The below code is the WHEN_BUTTON_PRESSED Trigger for the ENTER_QUERY (Push Button):
We see 3 button in your code. How can we know which one is ENTER_QUERY button. Your code says...
ENTER_QUERY;
set_item_property (it_id1,label,'ENTER QUERY');
So, it says.. BUTTON.EN_QUERY label will be ENTER QUERY
Then why the code, (if :system.mode<>'ENTER-QUERY' THEN set_item_property (it_id1,label,'CANCEL QUERY');) ?? which says if system mode is not equal to ENTER_QUERY,
then it tells to display CANCEL QUERY.
it says.. BUTTON.EN_QUERY label will be CANCEL QUERY

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