fect for any sessions that match the
<em>user-OR-expression</em>. The authenticated user must be one of the users
listed in the expression for the directives contained to be applied.  Note
that <code>!</code> notation in front of a user name in the expression is
supported.

<p>
The given <em>user-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 expre