Buffalo Surveillance Server Administrator's Manual page 317

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Wildcard Description
OR links two terms and finds a matching
document when either of the terms exist
in a document. || can be used in place of
OR. OR is the default conjunction
operator. This means that if there is no
Boolean operator between two terms, OR
is assumed.
For example, to search for documents
that contain corporate compliance or
just compliance, you would use
"corporate compliance" OR
compliance. The quotes indicate a
single phrase.
AND
AND matches documents where both
terms exist anywhere in the text of a
single document. && can be used in
place of AND.
For example, to search for documents
that contain corporate compliance and
Second Quarter 2007 you would use
"corporate compliance" AND "Second
Quarter 2007". The quotes indicate a
single phrase.
+
+ (plus symbol) requires that the term
after + exist somewhere in a single file.
For example, to search for files that must
contain compliance and may contain
corporate you would use
corporate +compliance.
NOT
NOT excludes documents that contain
the term after NOT. ! (exclamation point)
or - (minus symbol) can be used in place
of NOT.
For example, to search for documents
that contain corporate but not
compliance use, corporate NOT
compliance.