Terminology
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Virtual store *
A certificate store that consists of a collection of other certificate stores. A single search or enumeration function on a virtual store will search all of the stores that are members of the virtual stores collection. Any addition to a virtual store will add an element to one of the members of that store.
*http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secgloss/security/security_glossary.asp