title: Can I find a filename from a filehandle in Tcl?
body: <p>Similar to <a href="https://stackoverflow.com/questions/2813092/can-i-find-a-filename-from-a-filehandle-in-perl">Can I find a filename from a filehandle in Perl?</a> but in Tcl.</p>
  
  <p>I plan to cache filename-filehandle associations anyway, so I'm asking purely out of curiosity--particularly of the "operating system wizardry" mentioned in the link.  Is it possible in Tcl?</p>
  
  <p>If it matters, I'm (forced into) using Tcl 8.0.5 on SunOS 5.10.</p>