Edit cell in basic table field

[David Epstein]

If I check "basic table object" in the field property inspector, and  
check "Edit cell," clicking on the table field causes a small  
unlocked field to be created at the cell's location, which on tab or  
arrowkey has its contents written to the cell.

Is there some way to have a script trap the relevant information  
about what is going on, e.g., that a cell has just been "opened for  
editing", that a cell has just been edited, which cell it is, etc.?

I assume that this "Edit Cell" activity is governed by a script that  
is reading a custom property, but I see no indication that the field  
actually has such a property or where the script is.

Many thanks.

David Epstein