>>>Following problem: I have a DBF table that is open shared by multiple users. I like to detect if changes are done to the table, but since the table is opened shared and in use the timestamp of the actual DBF file does not change, until all users have closed the table.
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>>>To do a query and comparison by content would be too slow. So I was wondering if there is some low level function approach I could use to detect the before-after differences? The simplest would be Reccount(), but I need to detect content changes where it does not change the recordcount.
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>>LUPDATE() should work in this case
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>Thanks, that sounds exactly like what I am looking for. Incredible what functions there exist in VFP.

And this one is about 30 years old now.