>>Hi Erik,
>>
>>>This is pretty cool. It also means that you can add a property to store an object reference that will persist through a RELEASE ALL.
>>
>>Sure, RELEASE ALL won't release this object, but CLEAR ALL does.
>>
>
>Christof:
>
>CLEAR ALL still leaves the property and its associated value as a property of the _screen object.

Christof is right; when the property contains a reference to an object, the object is cleared regardless with CLEAR ALL. The property still exists, and can be assigned a new value, but the object is gone.