Hi Dwayne,

Latest is just before earliest, and earliest SeqNumber <> Latest + 1.
This point is reached when

 SeqNumber (next) <> SeqNumber (now) + 1 [ignore overflow]

Run through by adding 1 to the last SeqNumber, if next SeqNumber equal
to that => the point is not reached.  Search until point is reached.
Or you can transverse in the opposite direction and look for SeqNumber
(now) <> SeqNumber(next) - 1.

Hope it helps.

Mail me a copy of your codes if possible when you are done.

Ling SM