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@@ -444,3 +444,28 @@ Callback: Action=EFI_BROWSER_ACTION_FORM_CLOSE, QuestionId=0x0001, Type=EFI_IFR_
I hope all of these experiments have got you some understanding about when and how the `Callback()` function is executed.
+To finish this lesson here is a logic diagram for an individual numeric element with the current value of 8:
+```
+ Open form (even before the form is displayed)
+EFI_BROWSER_ACTION_FORM_OPEN (Value=0)
+EFI_BROWSER_ACTION_RETRIEVE (Value=8)
+ |
+ -------------------------------------------------
+ | |
+ Change value from 8 to 8 Close form
+EFI_BROWSER_ACTION_CHANGING (Value=8) EFI_BROWSER_ACTION_FORM_CLOSE (Value=8)
+ |
+ -------------------------------------------------
+ | |
+ Change value from 8 to 9 Close form
+EFI_BROWSER_ACTION_CHANGING (Value=9) EFI_BROWSER_ACTION_FORM_CLOSE (Value=8)
+EFI_BROWSER_ACTION_CHANGED (Value=9)
+ |
+ -------------------------------------------------------------------------------------------------
+ | | |
+ Submit Close form with sumbit Close form without submit
+EFI_BROWSER_ACTION_SUBMITTED (Value=9) EFI_BROWSER_ACTION_SUBMITTED (Value=9) EFI_BROWSER_ACTION_CHANGED (Value=8)
+ | EFI_BROWSER_ACTION_FORM_CLOSE (Value=9) EFI_BROWSER_ACTION_FORM_CLOSE (Value=8)
+ Close
+EFI_BROWSER_ACTION_FORM_CLOSE (Value=9)
+```