"looking for xxx" mechanism which is invoked by the idle message. If nothing is being looked for at a particular idle, the lookingForNothing message is sent. This method tries to find a field that has not yet been filled in and calls fillField to set up the looking for mechanism to fill that field in. This process involves checking whether the field is short or long: long fields can contain multiple lines and are terminated by a period (.) on a line by itself.