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<p>
Appends the the context corresponding to the <code>key</code> parameter. 
<p>
If there is a local <a class="el" href="classlog4cxx_1_1_m_d_c.html">MDC</a> copy, possibly because we are in a logging server or running inside <a class="el" href="classlog4cxx_1_1_async_appender.html">AsyncAppender</a>, then we search for the key in <a class="el" href="classlog4cxx_1_1_m_d_