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from preamble:
"Change Set: PointerExplorer Date: 29 September 2004 Author: avi
md: repackaged as a changeset.
A variant on the ObjectExlorer that works 'backwards': like the ObjectExplorer, it shows a tree of objects, but expanding a node won't show the objects which that node references, but rather the objects that reference that node. Its main use is to track down memory leaks: if you want to know why a particular object is still alive, open a PointerExplorer on it and drill down until you find the root object that's referencing it. For example, find all the references to the symbol #zot with:
PointerExplorer new openExplorerFor: #zot
For the 'name' of the object, the PointerExplorer shows each object's identityHash, to allow the user to identify when two similar objects are identical and notice cycles."!
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