ntain any configuration
directives that should be in effect for any sessions that match the
<em>class-expression</em>.  <code>Classes</code> must be enabled for this
context to work properly; the connecting client must be in any of the classes
listed in the expression for the directives contained to be applied.  Note
that <code>!</code> notation in front of a class name in the expression is
supported.

<p>
The given <em>class-expression</em> may optionally be prefixed
with either the &quot;AND&quot; or &quo