</I> and element of this array -
<I>object handle</I>. These are two copies of object
indices in DyBASE, one of which is current and other - shadow.
Header of database contains pointers to both object indices and indicator
which index is current at this moment.<P>

When object is modified first time, it is cloned
(copy of the object is created) and object handle in current index is
changed to point to newly created object copy. And shadow index still
contains handle which points to the original version of t