Remember the Roots3 time? in the reference field we could only fill in 8 characters too. So I took my generationnumber followed by the Ahnentafelnumber. This way I (startperson) was I-1, my father was II-2 and mother was II-3 and so on, for the brothers and sisters and further I took the reference of the father and builded further so my brother became II2-B (father = II2 and my brother is younger then me therefor 'B')
These reference numbers were imported into RIV - RV and now UFT. I take the reference to name my external files (pictures etc...) so my fathers picture is II2.JPG and so on.