Look section -files on this site and also papers of 1999-2000 of FoxTalk
( not sure about autor, ?Dug Heinetz, tell you later today) I used two these variants.
They really work, but raport layout is not good, I still improving the code
to make them nice working.
Best wishes, Vladimir Zhuravlev.
MVP-2006-2011, PHD in Math and Physics ,
host of
www.foxclub.ru,
VFP lector at Interface and Microinform companies
Head science researcher of VNIIA Rosatom.