The user activates "Update..." and sees the following message:

The main menu is updated:

When the user selects "Setting a PIN", an info screen is displayed:

If the user chooses "No" he or she is asked whether they would like to set the PIN later. If they choose "No" again, the whole "PIN setting" feature will be removed from the MIDlet.

If the user chooses to set up a PIN, they need to fill in two input fields. The input is validated. If the data is correct, the PIN is stored and the user will need to enter it when the application is started.

The user can enter a wrong PIN twice - and only a warning message will be displayed. If a wrong PIN is entered for the third time, the whole PIN functionality will be removed from the MIDlet and the user will have to log in using the full user id and password.

The Screen instruction displays a screen asking the user to set up a PIN. If the answer is positive, SpecifyPinScreen is called, otherwise - RemovePackageScreen.

SpecifyPinScreen displays two text input fields where the user enters 4-digit PIN. Option "Save" refers to VerifyPinSaveAndRemove, which reads the entered PINs, validates them and, if the PIN is correct, stores it the "permanent" location and updates STARTUP_INSTRUCTION to one that will request the PIN. The final action of VerifyPinSaveAndRemove is to call RemovePackage.

RemovePackageScreen is a instruction that asks the user whether they would like to set up the PIN in the future. RemovePackage is associated with "No".

RemovePackage deletes all resources associated with this service from the MIDlet.

All instructions are placed in the "pin" package.

Notice the NewStartupInstruction which belongs to the package but was not shown in the functional diagram. This is the instruction that will replace the content of STARTUP_INSTRUCTION node when the PIN is set.