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A user can belong to many groups simultaneously.
On some Unix systems, a user can only be /active/ in one group at a time, and
can switch groups on the fly using commands. Of course, the user can only switch
between groups that s/he already belongs to.
On other Unix systems (I believe, most every recent Unix since BSD) a user can
both belong to many groups simultaneously, and be active in many groups
The Posix/Single Unix Specification standards? http://www.opengroup.org/
IT Specialist, Enterprise Data Systems,
Enterprise Technology Solutions, TD Bank Financial Group
(Opinions expressed are my own, not my employers')
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