em</i> to use files stored in memory rather than on disk. Tcl
provides an almost uniform interface to these very different
resources, so that in general you do not need to concern yourself
with the details.</p>

<dl>
<dt><code class="keyword">open</code> <code class=
"arg">fileName</code> <code class="arg">?access?</code> <code
class="arg">?permission?</code></dt>

<dd>Opens a file and returns a token to be used when accessing the
file via <code class="keyword">gets</code>, <code class=
"keyword">puts</code