e tooltip for the start button.</li>
<li><strong>start_func</strong> – Required. Function to be called when the
start button is pressed.</li>
<li><strong>done_func</strong> – Optional function to be called when the
submit function is completed.</li>
<li><strong>cachename</strong> – Optional. Name of the tool or other unique
name that will be used for the cache directory.</li>
<li><strong>cachecb</strong> – Optional function to call when the cache is cleared.</li>
<li><strong>outcb</strong> – Optio