A group is a list of registered users, groups, or both.  Groups are
mechanisms that help manage access control for PURLs and domains.
This mechanism is useful for specifying other readers, writers, or
maintainers of PURLs and domains you own.  In and of themselves,
groups do not bestow new capabilities on their members.  A group must
be specified as a member of a PURL's or domain's read, write, or
maintenance access control list to have any effect on its members.
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More information about groups and access control is available in the
<a href="http://purl.oclc.org/OCLC/PURL/FAQ"> PURL FAQ</a>.