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    <div class="sect1" lang="en" xml:lang="en">
      <div class="titlepage">
        <div>
          <div>
            <h2 class="title" style="clear: both"><a id="rep_ex_comm"></a>Ex_rep_base: a TCP/IP based communication infrastructure</h2>
          </div>
        </div>
      </div>
      <p>
Base API applications must implement a
communication infrastructure.  The communication infrastructure
consists of three parts: a way to map environment IDs to particular
sites, the functions to send and rec