from preamble:

"Change Set:		PointerExplorer-ab
Date:			22 August 2003
Author:			Avi Bryant

A very simple subclass of the ObjectExplorer which works backwards:
starting at a child it allows you to inspect the tree of its parents. 
This is much more convenient than the 'objects pointing to this value'
menu item in the Inspector.

eg:
PointerExplorer new openExplorerFor: #to:do:
"!
-------------- next part --------------
A non-text attachment was scrubbed...
Name: PointerExplorer-ab.cs.gz
Type: application/octet-stream
Size: 694 bytes
Desc: not available
Url : http://lists.squeakfoundation.org/pipermail/squeak-dev/attachments/20030822/b6cc5b73/PointerExplorer-ab.cs.obj