> Is it possible to write changes in the buffer to the dataset?

No. AFAIK all the relevant code (post etc) depends on changes applied
to the *current* row of the dataset.

Generally the best way of handling this sort of thing is to select the
record into a TIB_Cursor component in the background and perform your
operations there. Same effect without needing massive changes to the
buffered dataset component.

hth

--
Geoff Worboys - TeamIBO
Telesis Computing