applied.  Note that <code>!</code> notation in front of a group name in the
expression is supported.

<p>
The given <em>group-expression</em> may optionally be prefixed
with either the &quot;AND&quot; or &quot;OR&quot; keywords, which affect how
the expression is evaluated: if &quot;AND&quot; is used, then <b>all</b>
portions of the expression must evaluate to TRUE for the configuration context
to be applied to the current session; if &quot;OR&quot; is used, then <b>any</b>
portion of the expression must be