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When the AddressForm is closed, it signals a user-defined event: 
SIGNAL 

     SIGNAL event(u_detail_form_closed)

The MainForm has an event routine which handles this event by setting the reference to the AddressForm to *NULL: 
EVTROUTINE 

     EVTROUTINE handling(#AddressForm.u_Detail_form_closed)
     SET_REF com(#AddressForm) to(*null)
     ENDROUTINE

This means that when AddressForm closes, it is removed from memory. The form itself as well as the button and the fields on it all disappear from the system.