eive messages, and the application
architecture that supports the particular communication infrastructure
used (for example, individual threads per communicating site, a shared
message handler for all sites, a hybrid solution).  The communication
infrastructure for ex_rep_base is implemented in the file
<code class="filename">ex_rep/base/rep_net.c</code>, and each part of that infrastructure
is described as follows.</p>
      <p>Ex_rep_base maintains a table of environment ID to TCP/IP port
mappings.  A poi