 two principal things you want to avoid in the high priority thread: first, time-consuming or unpredictable operations such as file access, and second, anything that will block execution for any length of time &ndash; for example, showing a dialog box (including a file dialog).</p>
<p>The procedure for using a qelem is analogous to that for using a clock.</p>
<ol type="1">
<li>Add a member to your object's data structure to hold a pointer to the qelem <div class="fragment"><div class="line"><span class="key