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Virtual Directories. "A virtual directory functions as an abstraction layer
between applications and data repositories." [20] In contrast to metadirectories,
virtual directories do not maintain the data in a standalone data source
(though some offer data caching, which does store data locally for improved performance).
Rather, virtual directories reference various data sources and present
a consolidated view to the end user. This has the advantage of not requiring
data synchronization - the data presented is always real-time, directly from the
source. Most computer audit implementations have the additional capability
of acquiring data from sources other than directories, such as databases, and
presenting this information to end users via LDAP.
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