Ariel,

CurVal() and OldVal() will only be different if another user has changed the record since you last read it. CurVal() tells you teh current value for the field on disk and OldVal() tells you what value your buffer started with. So ;

SELECT MyTable
* Buffered: Field1 = "XYZ"
Replace Field1 WITH "ABC"
? CurVal("MyTable.Field1")  && Returns XYZ
? OldVal("MyTable.Fiedl1")  && Returns XYZ
? MyTable.Field1 && Returns ABC
* Another user changes the value to MNO and updates the table
? CurVal("MyTable.Field1")  && Returns MNO
? OldVal("MyTable.Fiedl1")  && Returns XYZ