e child
interpreters can have their own sets of variables, commands and
open files, or they can be given access to items in the parent
interpreter.</p>

<p>If the child is created with the <code class="arg">-safe</code>
option, it will not be able to access the file system, or otherwise
damage your system. This feature allows a script to evaluate code
from an unknown (and untrusted) source.</p>

<p>The names of child interpreters are a hierarchical list. If
interpreter <code class="keyword">foo</code> is a 