I've read

  http://robmensching.com/blog/posts/2003/10/18/Component-Rules-101

and I'm still confused about something. Suppose a component gets
installed more than once, but to different places. This can happen if
several product installers include the same component (same component
GUID, containing identical resources), so we might end up with a copy of
the component's resources in both

  Program Files\ProductA, and
  Program Files\ProductB

A similar case occurs if both product installers use a merge module, but
direct the MergeRedirectFolder to different places.

How does the windows installer keep track of this situation? If a
product is patched, do both copies of the resource get patched or just
one? If one of the two products is uninstalled, does one of the
resources get uninstalled at that time, or do both copies remain on disk
until the second product is also uninstalled?

-- 
Cheers,
John

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