exists, otherwise returns
0.</dd>
</dl>

<p>Points to remember about Tcl file access:</p>

<ul>
<li>The file I/O is buffered. The output may not be sent out when
you expect it to be sent. Files will all be closed and flushed when
your program exits normally, but may only be closed (not flushed)
if the program is terminated in an unexpected manner.</li>

<li>There are a finite number of open file slots available. If you
expect the program to run in a manner that will cause it to open
several files, remember 