Note: this is a reference post ...
What are they? Some kinds of entries are automatically duplicated (or "twinned") by windows.
If an addition, change, or removal affects either one, the other is handled by windows the same way at the same time.
Examples:
* Entries under both these keys are automatically duplicated. Many, perhaps most, HKCU/HKUS keys with file references are twinned.
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Less often, twinning also occurs in some HKCR/HKCU, HKCR/HKLM, HKLM/HKUS, and even HKUS/HKUS paired keys (maybe others as well?).
Vista seems to have more such keys -- some automatic tripling, even quadrupling of entries may be occurring. File references are usually, if not always, involved.
Optimally, Registry Cleaner would display errors for just one of such twinned entries. Processing and showing both slows down Registry Cleaner performance. It also probably causes extra windows kernel time when a Fix or Delete action is done.
