>Like many things, support for nulls is a dangerous tool in careless hands.

Yes, and NULL is almost impossible to completely avoid.

Set Null Off   && <-- NULL is turned off!!
Set Multilocks On

Create Table Foo (test c(10) NOT NULL) && <-- Field does not accept NULL!!

CursorSetProp("Buffering",5)
Append Blank

? Oldval("foo.test")   && This still gives NULL!!