When you are working with buffering, no rules and data stores are produced until you no run a TableUpdate() (or TableRevert() to discard the changes)

To activate buffering do the follow:

Open Database mydatabase
Use mytable In 0 Alias mytable Shared
CursorSetProp( "buffering", 5, "mytable" ) && This line activate the buffering
...
***** Work with the table like you need it
...
*** When no more changes
If AcceptChanges  && thats means if you (or user) want to save the changes
    TableUpdate()
Else
    TableRevert()
EndIf

For more and best information go to VFP help index and take a look to TableUpdate, TableRevert, CursorSetProp, And every "See Also" theme.

Good Luck!