it evaluates the script
in the child interpreter instead of the primary interpreter. The
<code class="command">interp eval</code> command concatenates the
args into a string, and ships that line to the child interpreter to
evaluate.</dd>

<dt><code class="command">interp alias</code> <code class=
"reqarg">srcPath srcCmd targetPath targetCmd</code> <code class=
"optarg">arg arg</code></dt>

<dd>The <code class="command">interp alias</code> command allows a
script to share procedures between child interpreter