with the <tt>File->Open URL...</tt> command, but you should realize that
you are now on untested ground.</p>
+ <p>Another potential problem source is that you are behind a firewall. This version
+ of PackageManager uses the Unix method of setting a firewall: you need to set the
+ environment variable <tt>http_proxy</tt> to <tt>"http://<i>proxyhost</i>:<i>port</i>"</tt>.
+ See <a href="http://developer.apple.com/qa/qa2001/qa1067.html">Apple Technical
+ Q&A QA1067</a> for instructions.</p>