ith <code class="computeroutput">boost::asio::error::operation_not_supported</code>
            when run on Windows XP, Windows Server 2003, and earlier versions of
            Windows, unless BOOST_ASIO_ENABLE_CANCELIO is defined. However, the CancelIo
            function has two issues that should be considered before enabling its
            use:
          </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
                It will only cancel as